feat: scaffold deployment-policies monorepo

OPA/Rego deployment gateway policies: 5 rules (valid-environment,
require-approvals, no-self-approval, block-weekends, freeze-window),
a deploy-gate combining them, JSON schemas, scenario-driven tests,
Gitea Actions CI (verify + publish to generic registry), changesets
versioning, Makefile and scripts.

policies/gates/deploy-gate/gate_test.rego

@@ -0,0 +1,49 @@
+# METADATA
+# schemas:
+#   - input: schema["input"]
+#   - data: schema["data"]
+
+package gate.deploy_gate_test
+
+import data.rules.block_weekends as block_weekends
+import data.rules.freeze_window as freeze_window
+import data.rules.no_self_approval as no_self_approval
+import data.rules.require_approvals as require_approvals
+import data.rules.valid_environment as valid_environment
+import rego.v1
+
+violations_for[scenario_name] contains code if {
+	some scenario_name, scenario in data.scenarios
+	some v in valid_environment.violations with input as scenario.input with data.deploygate as scenario.data
+	code := v.code
+}
+
+violations_for[scenario_name] contains code if {
+	some scenario_name, scenario in data.scenarios
+	some v in require_approvals.violations with input as scenario.input with data.deploygate as scenario.data
+	code := v.code
+}
+
+violations_for[scenario_name] contains code if {
+	some scenario_name, scenario in data.scenarios
+	some v in no_self_approval.violations with input as scenario.input with data.deploygate as scenario.data
+	code := v.code
+}
+
+violations_for[scenario_name] contains code if {
+	some scenario_name, scenario in data.scenarios
+	some v in block_weekends.violations with input as scenario.input with data.deploygate as scenario.data
+	code := v.code
+}
+
+violations_for[scenario_name] contains code if {
+	some scenario_name, scenario in data.scenarios
+	some v in freeze_window.violations with input as scenario.input with data.deploygate as scenario.data
+	code := v.code
+}
+
+test_scenario[scenario_name] if {
+	some scenario_name, scenario in data.scenarios
+	expected := {code | code := scenario.expect.violations[_]}
+	{code | code := violations_for[scenario_name][_]} == expected
+}

policies/gates/deploy-gate/package.json

@@ -0,0 +1,13 @@
+{
+  "name": "deploy-gate",
+  "version": "0.0.0",
+  "description": "Combined deployment gateway: validates the environment, approval counts, self-approval, weekends and freeze windows.",
+  "private": true,
+  "dependencies": {
+    "valid-environment": "0.0.0",
+    "require-approvals": "0.0.0",
+    "no-self-approval": "0.0.0",
+    "block-weekends": "0.0.0",
+    "freeze-window": "0.0.0"
+  }
+}

policies/gates/deploy-gate/scenarios.json

@@ -0,0 +1,107 @@
+{
+  "scenarios": {
+    "all_pass": {
+      "input": {
+        "deployment": {
+          "environment": "production",
+          "service": "payments-api",
+          "version": "1.2.3",
+          "requested_by": "alice",
+          "created_at": "2026-09-15T10:00:00Z"
+        },
+        "approvals": [
+          {"by": "bob", "at": "2026-09-15T09:00:00Z", "active": true},
+          {"by": "carol", "at": "2026-09-15T09:30:00Z", "active": true}
+        ]
+      },
+      "data": {
+        "config": {
+          "production": {"min_approvals": 2, "block_weekends": true}
+        },
+        "freeze_windows": [
+          {"environment": "production", "start": "2026-12-20T00:00:00Z", "end": "2026-12-31T23:59:59Z"}
+        ]
+      },
+      "expect": {
+        "allow": true,
+        "violations": []
+      }
+    },
+    "weekend_plus_no_approvals": {
+      "input": {
+        "deployment": {
+          "environment": "production",
+          "service": "payments-api",
+          "version": "1.2.3",
+          "requested_by": "alice",
+          "created_at": "2026-09-12T10:00:00Z"
+        },
+        "approvals": [
+          {"by": "bob", "at": "2026-09-12T09:00:00Z", "active": true}
+        ]
+      },
+      "data": {
+        "config": {
+          "production": {"min_approvals": 2, "block_weekends": true}
+        },
+        "freeze_windows": []
+      },
+      "expect": {
+        "allow": false,
+        "violations": ["weekend_deploy", "insufficient_approvals"]
+      }
+    },
+    "freeze_window_blocks": {
+      "input": {
+        "deployment": {
+          "environment": "production",
+          "service": "payments-api",
+          "version": "1.2.3",
+          "requested_by": "alice",
+          "created_at": "2026-12-24T10:00:00Z"
+        },
+        "approvals": [
+          {"by": "bob", "at": "2026-12-24T09:00:00Z", "active": true},
+          {"by": "carol", "at": "2026-12-24T09:30:00Z", "active": true}
+        ]
+      },
+      "data": {
+        "config": {
+          "production": {"min_approvals": 2, "block_weekends": false}
+        },
+        "freeze_windows": [
+          {"environment": "production", "start": "2026-12-20T00:00:00Z", "end": "2026-12-31T23:59:59Z"}
+        ]
+      },
+      "expect": {
+        "allow": false,
+        "violations": ["deploy_in_freeze"]
+      }
+    },
+    "self_approval": {
+      "input": {
+        "deployment": {
+          "environment": "production",
+          "service": "payments-api",
+          "version": "1.2.3",
+          "requested_by": "alice",
+          "created_at": "2026-09-15T10:00:00Z"
+        },
+        "approvals": [
+          {"by": "alice", "at": "2026-09-15T09:00:00Z", "active": true},
+          {"by": "carol", "at": "2026-09-15T09:30:00Z", "active": true}
+        ]
+      },
+      "data": {
+        "config": {
+          "production": {"min_approvals": 2, "block_weekends": true}
+        },
+        "freeze_windows": []
+      },
+      "expect": {
+        "allow": false,
+        "violations": ["self_approval"]
+      }
+    }
+  }
+}

policies/gates/deploy-gate/schema/data.json

@@ -0,0 +1,45 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "type": "object",
+  "additionalProperties": true,
+  "properties": {
+    "deploygate": {
+      "type": "object",
+      "additionalProperties": true,
+      "properties": {
+        "config": {
+          "type": "object",
+          "additionalProperties": {
+            "type": "object",
+            "additionalProperties": true
+          }
+        },
+        "freeze_windows": {
+          "type": "array",
+          "items": {
+            "type": "object",
+            "additionalProperties": true,
+            "required": ["environment", "start", "end"],
+            "properties": {
+              "environment": {"type": "string"},
+              "start": {"type": "string", "format": "date-time"},
+              "end": {"type": "string", "format": "date-time"}
+            }
+          }
+        }
+      }
+    },
+    "rules": {
+      "type": "object",
+      "additionalProperties": true
+    },
+    "gate": {
+      "type": "object",
+      "additionalProperties": true
+    },
+    "scenarios": {
+      "type": "object",
+      "additionalProperties": true
+    }
+  }
+}

policies/gates/deploy-gate/schema/input.json

@@ -0,0 +1,31 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "type": "object",
+  "additionalProperties": true,
+  "properties": {
+    "deployment": {
+      "type": "object",
+      "additionalProperties": true,
+      "required": ["environment", "service", "requested_by", "created_at"],
+      "properties": {
+        "environment": {"type": "string"},
+        "service": {"type": "string"},
+        "requested_by": {"type": "string"},
+        "created_at": {"type": "string", "format": "date-time"}
+      }
+    },
+    "approvals": {
+      "type": "array",
+      "items": {
+        "type": "object",
+        "additionalProperties": true,
+        "required": ["by", "active"],
+        "properties": {
+          "by": {"type": "string"},
+          "active": {"type": "boolean"},
+          "at": {"type": "string", "format": "date-time"}
+        }
+      }
+    }
+  }
+}