Execute scoped deploy action reliably

.gitea/actions/quickstack-oci/deploy.test.mjs

@@ -4,6 +4,7 @@ import test from "node:test";
 import {
   deployExactImage,
   mergeEnvironment,
+  resolveDeploymentBranch,
   selectDeployment,
   toSavePayload,
   validateTarget,
@@ -33,6 +34,28 @@ test("selects only the deployment matching the triggering branch", () => {
   assert.equal(selectDeployment(config, "other"), null);
 });
 
+test("resolves push and pull request deployment branches without accepting empty context values", () => {
+  assert.equal(
+    resolveDeploymentBranch({
+      eventName: "push",
+      environment: { GITHUB_REF_NAME: "", GITEA_REF_NAME: "main" },
+    }),
+    "main",
+  );
+  assert.equal(
+    resolveDeploymentBranch({
+      eventName: "pull_request",
+      environment: { GITHUB_BASE_REF: "", GITEA_BASE_REF: "" },
+      eventPayload: { pull_request: { base: { ref: "main" } } },
+    }),
+    "main",
+  );
+  assert.throws(
+    () => resolveDeploymentBranch({ eventName: "pull_request", environment: {}, eventPayload: {} }),
+    /Pull request base branch/,
+  );
+});
+
 test("validates OCI paths and repository-local build paths", () => {
   assert.equal(validateTarget({ name: "Web", image: "Owner/Web", appId: "app-1" }).image, "owner/web");
   assert.throws(() => validateTarget({ name: "Web", image: "owner/web", appId: "app-1", context: "../secret" }), /inside/);