[CI] do not hardcode the Forgejo release in end-to-end testing

Now that Forgejo has its own release number, use the Makefile as a
reference.

Also document and improve support for debugging this
pull_request_target workflow by using a branch in the repository.

.forgejo/cascading-pr-end-to-end

@@ -5,17 +5,26 @@ set -ex
 end_to_end=$1
 end_to_end_pr=$2
 forgejo=$3
-forgejo_pr=$4
+forgejo_pr_or_ref=$4
+
+cd $forgejo
+full_version=$(make show-version-full)
+major_version=$(make show-version-major)
 
-head_url=$(jq --raw-output .head.repo.html_url < $forgejo_pr)
-test "$head_url" != null
-branch=$(jq --raw-output .head.ref < $forgejo_pr)
-test "$branch" != null
 cd $end_to_end
-echo $head_url $branch 7.0.0+0-gitea-1.22.0 > forgejo/sources/1.22
 date > last-upgrade
 
-base_url=$(jq --raw-output .base.repo.html_url < $forgejo_pr)
-test "$base_url" != null
+if test -f "$forgejo_pr_or_ref" ; then
+    forgejo_pr=$forgejo_pr_or_ref
+    head_url=$(jq --raw-output .head.repo.html_url < $forgejo_pr)
+    test "$head_url" != null
+    branch=$(jq --raw-output .head.ref < $forgejo_pr)
+    test "$branch" != null
+    echo $head_url $branch $full_version > forgejo/sources/$major_version
+else
+    forgejo_ref=$forgejo_pr_or_ref
+    echo $GITHUB_SERVER_URL/$GITHUB_REPOSITORY ${forgejo_ref#refs/heads/} $full_version > forgejo/sources/$major_version
+fi
+
 test "$GITHUB_RUN_NUMBER"
-echo $base_url/actions/runs/$GITHUB_RUN_NUMBER/artifacts/forgejo > forgejo/binary-url
+echo $GITHUB_SERVER_URL/$GITHUB_REPOSITORY/actions/runs/$GITHUB_RUN_NUMBER/artifacts/forgejo > forgejo/binary-url

.forgejo/workflows/cascade-setup-end-to-end.yml

@@ -1,5 +1,23 @@
+# Copyright 2024 The Forgejo Authors
 # SPDX-License-Identifier: MIT
+#
+# To modify this workflow:
+#
+#  - push it to the wip-ci-end-to-end branch on the forgejo repository
+#    otherwise it will not have access to the secrets required to push
+#    the cascading PR
+#
+#  - once it works, open a pull request for the sake of keeping track
+#    of the change even if the PR won't run it because it will use
+#    whatever is in the default branch instead
+#
+#  - after it is merged, double check it works by setting the
+#    run-end-to-end-test on a pull request (any pull request will doe
+#
 on:
+  push:
+    branches:
+      - 'wip-ci-end-to-end'
   pull_request_target:
     types:
       - labeled
@@ -20,9 +38,18 @@ jobs:
           cat <<'EOF'
           ${{ toJSON(github.event.pull_request.labels.*.name) }}
           EOF
+          cat <<'EOF'
+          ${{ toJSON(github.event) }}
+          EOF
 
   build:
-    if: ${{ !startsWith(vars.ROLE, 'forgejo-') && github.event.action == 'label_updated' && contains(github.event.pull_request.labels.*.name, 'run-end-to-end-tests') }}
+    if: >
+      !startsWith(vars.ROLE, 'forgejo-') && (
+        github.event_name == 'push' ||
+        (
+          github.event.action == 'label_updated' && contains(github.event.pull_request.labels.*.name, 'run-end-to-end-tests')
+        )
+      )
     runs-on: docker
     container:
       image: 'docker.io/node:20-bookworm'
@@ -55,19 +82,29 @@ jobs:
           path: forgejo
 
   cascade:
-    if: ${{ !startsWith(vars.ROLE, 'forgejo-') && github.event.action == 'label_updated' && contains(github.event.pull_request.labels.*.name, 'run-end-to-end-tests') }}
+    if: >
+      !startsWith(vars.ROLE, 'forgejo-') && (
+        github.event_name == 'push' ||
+        (
+          github.event.action == 'label_updated' && contains(github.event.pull_request.labels.*.name, 'run-end-to-end-tests')
+        )
+      )
     needs: [build]
     runs-on: docker
     container:
       image: node:20-bookworm
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/cascading-pr@v1
+        with:
+          fetch-depth: '0'
+          show-progress: 'false'
+      - uses: actions/cascading-pr@v2
         with:
           origin-url: ${{ env.GITHUB_SERVER_URL }}
           origin-repo: ${{ github.repository }}
           origin-token: ${{ secrets.END_TO_END_CASCADING_PR_ORIGIN }}
           origin-pr: ${{ github.event.pull_request.number }}
+          origin-ref: ${{ github.event_name == 'push' && github.event.ref }}
           destination-url: https://code.forgejo.org
           destination-fork-repo: cascading-pr/end-to-end
           destination-repo: forgejo/end-to-end