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/rules/require-approvals/package.json

@@ -0,0 +1,6 @@
+{
+  "name": "require-approvals",
+  "version": "0.0.0",
+  "description": "Denies deployments that do not have a sufficient number of active approvals.",
+  "private": true
+}

policies/rules/require-approvals/policy.rego

@@ -0,0 +1,34 @@
+# METADATA
+# schemas:
+#   - input: schema["input"]
+#   - data: schema["data"]
+
+package rules.require_approvals
+
+import rego.v1
+
+default allow := false
+
+allow if {
+	count(violations) == 0
+}
+
+violations contains {"code": "insufficient_approvals", "message": sprintf("need at least %d approval(s), got %d", [min_approvals, count(active_approvals)])} if {
+	cfg := data.deploygate.config[input.deployment.environment]
+	cfg.min_approvals > 0
+	count(active_approvals) < cfg.min_approvals
+}
+
+min_approvals := data.deploygate.config[input.deployment.environment].min_approvals if {
+	input.deployment
+}
+
+active_approvals contains approval if {
+	some approval in input.approvals
+	approval.active
+}
+
+violations contains {"code": "not_configured", "message": sprintf("no min_approvals configured for environment %q", [input.deployment.environment])} if {
+	input.deployment
+	not data.deploygate.config[input.deployment.environment].min_approvals
+}

policies/rules/require-approvals/policy_test.rego

@@ -0,0 +1,12 @@
+package rules.require_approvals_test
+
+import data.rules.require_approvals as rule
+import rego.v1
+
+test_scenarios[scenario_name] if {
+	some scenario_name, scenario in data.scenarios
+	actual := {code | code := rule.violations[_].code} with input as scenario.input with data.deploygate as scenario.data
+	expected := {code | code := scenario.expect.violations[_]}
+	actual == expected
+	rule.allow == scenario.expect.allow with input as scenario.input with data.deploygate as scenario.data
+}

policies/rules/require-approvals/scenarios.json

@@ -0,0 +1,96 @@
+{
+  "scenarios": {
+    "enough_approvals": {
+      "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}
+        }
+      },
+      "expect": {
+        "allow": true,
+        "violations": []
+      }
+    },
+    "insufficient_approvals": {
+      "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}
+        ]
+      },
+      "data": {
+        "config": {
+          "production": {"min_approvals": 2}
+        }
+      },
+      "expect": {
+        "allow": false,
+        "violations": ["insufficient_approvals"]
+      }
+    },
+    "revoked_approval_not_counted": {
+      "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": false}
+        ]
+      },
+      "data": {
+        "config": {
+          "production": {"min_approvals": 2}
+        }
+      },
+      "expect": {
+        "allow": false,
+        "violations": ["insufficient_approvals"]
+      }
+    },
+    "no_approval_required": {
+      "input": {
+        "deployment": {
+          "environment": "development",
+          "service": "payments-api",
+          "version": "1.2.3",
+          "requested_by": "alice",
+          "created_at": "2026-09-15T10:00:00Z"
+        },
+        "approvals": []
+      },
+      "data": {
+        "config": {
+          "development": {"min_approvals": 0}
+        }
+      },
+      "expect": {
+        "allow": true,
+        "violations": []
+      }
+    }
+  }
+}

policies/rules/require-approvals/schema/data.json

@@ -0,0 +1,27 @@
+{
+  "$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,
+            "properties": {
+              "min_approvals": {"type": "integer", "minimum": 0}
+            }
+          }
+        }
+      }
+    },
+    "rules": {
+      "type": "object",
+      "additionalProperties": true
+    }
+  }
+}

policies/rules/require-approvals/schema/input.json

@@ -0,0 +1,26 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "type": "object",
+  "additionalProperties": true,
+  "properties": {
+    "deployment": {
+      "type": "object",
+      "additionalProperties": true,
+      "required": ["environment"],
+      "properties": {
+        "environment": {"type": "string"}
+      }
+    },
+    "approvals": {
+      "type": "array",
+      "items": {
+        "type": "object",
+        "additionalProperties": true,
+        "required": ["active"],
+        "properties": {
+          "active": {"type": "boolean"}
+        }
+      }
+    }
+  }
+}