test: add reusable workflow expansion test (#1316)

end-to-end test covering https://codeberg.org/forgejo/forgejo/pulls/10525.

![image](/attachments/2bca39ea-67d9-4ae6-a940-e2b5f77b11d4)

Reviewed-on: https://code.forgejo.org/forgejo/end-to-end/pulls/1316
Co-authored-by: Mathieu Fenniak <mathieu@fenniak.net>
Co-committed-by: Mathieu Fenniak <mathieu@fenniak.net>

actions/actions.sh

@@ -180,5 +180,9 @@ function test_actions() {
         if dpkg --compare-versions $version ge 14.0; then
             run actions_verify_example matrix-dynamic
         fi
+
+        if dpkg --compare-versions $version ge 15.0; then
+            run actions_verify_example workflow-call-expansion
+        fi
     done
 }

actions/example-workflow-call-expansion/.forgejo/workflows/reusable.yml

@@ -0,0 +1,28 @@
+on:
+  workflow_call:
+
+jobs:
+  callee-1:
+    runs-on: docker
+    container:
+      image: data.forgejo.org/oci/node:22-bookworm
+      volumes:
+        - /srv/example:/srv/example
+    steps:
+      - name: indicate callee-1 hit
+        run: touch /srv/example/callee-1
+
+  callee-2:
+    needs: callee-1
+    runs-on: docker
+    container:
+      image: data.forgejo.org/oci/node:22-bookworm
+      volumes:
+        - /srv/example:/srv/example
+    steps:
+      - name: verify callee-1 completed
+        run: |
+          set -x
+          test -f /srv/example/callee-1
+      - name: indicate callee-2 hit
+        run: touch /srv/example/callee-2

actions/example-workflow-call-expansion/.forgejo/workflows/test.yml

@@ -0,0 +1,20 @@
+on:
+  push:
+
+jobs:
+  caller:
+    uses: ./.forgejo/workflows/reusable.yml
+
+  verify:
+    needs: [caller]
+    runs-on: docker
+    container:
+      image: data.forgejo.org/oci/node:22-bookworm
+      volumes:
+        - /srv/example:/srv/example
+    steps:
+      - name: verify callee-1 & callee-2 completed
+        run: |
+          set -x
+          test -f /srv/example/callee-1
+          test -f /srv/example/callee-2