feat: add schema versioning support

cmd/plugin/main.go

@@ -13,6 +13,8 @@ import (
 	plugin "github.com/SemRels/provider-github/internal/plugin"
 )
 
+const pluginSchemaVersion = 1
+
 func run(
 	ctx context.Context,
 	getenv func(string) string,
@@ -21,6 +23,7 @@ func run(
 	createRelease func(context.Context, plugin.Config) (*plugin.Release, error),
 	uploadAssets func(context.Context, plugin.Config, *plugin.Release, io.Writer),
 ) int {
+	fmt.Fprintf(stderr, "plugin_schema_version=%d\n", pluginSchemaVersion)
 	cfg, err := plugin.ConfigFromEnv(getenv)
 	if err != nil {
 		fmt.Fprintln(stderr, "provider-github:", err)

cmd/plugin/main_test.go

@@ -38,7 +38,7 @@ func TestRunSuccess(t *testing.T) {
 	if !uploadCalled {
 		t.Fatal("expected uploadAssets to be called")
 	}
-	if stderr.Len() != 0 || !strings.Contains(stdout.String(), "created v1.2.3") {
+	if stderr.String() != "plugin_schema_version=1\n" || !strings.Contains(stdout.String(), "created v1.2.3") {
 		t.Fatalf("stdout=%q stderr=%q", stdout.String(), stderr.String())
 	}
 }
@@ -68,7 +68,7 @@ func TestRunDryRun(t *testing.T) {
 	if uploadCalled {
 		t.Fatal("uploadAssets should not be called during dry-run")
 	}
-	if stderr.Len() != 0 || !strings.Contains(stdout.String(), "dry-run") {
+	if stderr.String() != "plugin_schema_version=1\n" || !strings.Contains(stdout.String(), "dry-run") {
 		t.Fatalf("stdout=%q stderr=%q", stdout.String(), stderr.String())
 	}
 }

schema/v1.json

@@ -0,0 +1,96 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://registry.semrel.io/schemas/plugins/provider-github/v1.json",
+  "title": "provider-github plugin configuration",
+  "description": "Schema v1 for the provider-github semrel plugin. Configure via SEMREL_* environment variables.",
+  "type": "object",
+  "properties": {
+    "SEMREL_PLUGIN_TOKEN": {
+      "type": "string",
+      "description": "GitHub token used to create the release. In practice this is often sourced from GITHUB_TOKEN.",
+      "writeOnly": true
+    },
+    "SEMREL_PLUGIN_OWNER": {
+      "type": "string",
+      "description": "GitHub repository owner or organization."
+    },
+    "SEMREL_PLUGIN_REPO": {
+      "type": "string",
+      "description": "GitHub repository name."
+    },
+    "SEMREL_PLUGIN_BASE_URL": {
+      "type": "string",
+      "default": "https://github.com",
+      "description": "GitHub web base URL.",
+      "format": "uri"
+    },
+    "SEMREL_PLUGIN_API_URL": {
+      "type": "string",
+      "default": "https://api.github.com",
+      "description": "GitHub API base URL.",
+      "format": "uri"
+    },
+    "SEMREL_PLUGIN_DRAFT": {
+      "type": "string",
+      "enum": [
+        "true",
+        "false",
+        "1",
+        "0"
+      ],
+      "default": "false",
+      "description": "Create the release as a draft."
+    },
+    "SEMREL_PLUGIN_PRERELEASE": {
+      "type": "string",
+      "enum": [
+        "true",
+        "false",
+        "1",
+        "0"
+      ],
+      "default": "false",
+      "description": "Mark the release as a prerelease."
+    },
+    "SEMREL_PLUGIN_NAME": {
+      "type": "string",
+      "description": "Optional release name override."
+    },
+    "SEMREL_PLUGIN_TAG_NAME": {
+      "type": "string",
+      "description": "Optional tag name override."
+    },
+    "SEMREL_PLUGIN_ASSETS": {
+      "type": "string",
+      "description": "Optional comma-separated file globs for release assets to upload."
+    },
+    "SEMREL_TAG_NAME": {
+      "type": "string",
+      "description": "Release tag name for the current semrel execution."
+    },
+    "SEMREL_VERSION": {
+      "type": "string",
+      "description": "Release version for the current semrel execution. semrel core may expose this as SEMREL_VERSION, SEMREL_TAG_NAME, or SEMREL_NEXT_VERSION depending on phase."
+    },
+    "SEMREL_NEXT_VERSION": {
+      "type": "string",
+      "description": "Calculated next release version when SEMREL_VERSION is not yet finalized."
+    },
+    "SEMREL_CHANGELOG": {
+      "type": "string",
+      "description": "Generated release notes or changelog content from semrel core."
+    },
+    "SEMREL_DRY_RUN": {
+      "type": "string",
+      "enum": [
+        "true",
+        "false",
+        "1",
+        "0"
+      ],
+      "default": "false",
+      "description": "When true, perform validation and logging only without executing side effects."
+    }
+  },
+  "additionalProperties": true
+}