Demo the test build.

.github/scripts/github-actions-create-and-commit-build.sh

@@ -0,0 +1,68 @@
+#!/usr/bin/env bash
+
+# The value of TAG_NAME and the content composited from it are described in terms of
+# the official release build. When creating a test build, a branch name is passed in,
+# but the related contents won't be adjusted to make the result as close as possible
+# to the official release build.
+REPO_URL=$1
+TAG_NAME=$2
+SOURCE_SHA=$(git rev-parse HEAD)
+
+# To build all actions:
+
+pushd ./packages/github-actions
+
+## 1. Build the JavaScript actions.
+npm ci --ignore-scripts
+npm run build
+
+## 2. Build the PHP actions into .zip files.
+./build-php-actions.sh
+
+popd
+
+# Use the github-actions bot account to commit.
+# https://api.github.com/users/github-actions%5Bbot%5D
+git config user.name github-actions[bot]
+git config user.email 41898282+github-actions[bot]@users.noreply.github.com
+
+# To move all actions to the top directory:
+## 1. Delete all files from version control system.
+git rm -r .
+git commit -q -m "Create the ${TAG_NAME} release build for the \`github-actions\` package."
+
+## 2. Get all actions back.
+git checkout HEAD^ -- ./packages/github-actions/actions
+git restore --staged .
+
+## 3. Avoid committing src directories to the build.
+echo "/packages/github-actions/actions/*/src" > .gitignore
+
+## 4. Unzip all of the PHP actions and replace them.
+for zipFile in $(find ./packages/github-actions/actions -name "*.zip" -mindepth 1 -maxdepth 1) ; do
+  actionDir="${zipFile%.*}"
+  rm -rf $actionDir
+  unzip $zipFile -d ./packages/github-actions/actions
+  rm $zipFile
+  echo "${actionDir}/src" | sed -e "s/^\.\//!/g" >> .gitignore
+done
+
+## 5. Move all actions to the top directory.
+git add ./packages/github-actions/actions
+git mv ./packages/github-actions/actions/* ./
+
+## 6. Create the README to point to the source revision of this build.
+tee README.md << END
+# Custom GitHub actions
+### This is the release build of version \`${TAG_NAME}\`.
+### :pushpin: Please visit [here to view the source code of this version](${REPO_URL}/tree/${SOURCE_SHA}/packages/github-actions).
+END
+git add README.md
+
+## 7. Complete the build for release or test.
+git commit -q --amend -C HEAD
+
+# The temporary `tmp-gha-release-build` branch is only for pushing to the remote repo.
+# Tagging it with a version tag will be proceeded with a separate step.
+git push origin HEAD:refs/heads/tmp-gha-release-build
+git push -d origin tmp-gha-release-build

.github/workflows/github-actions-create-test-build.yml

@@ -0,0 +1,40 @@
+name: GitHub Actions - Create Test Build
+run-name:  Create test build onto the ${{ github.ref_name }} branch by @${{ github.actor }}
+
+on:
+  workflow_dispatch:
+
+jobs:
+  CreateTestBuild:
+    name: Create Test Build
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Prepare node
+        uses: ./packages/github-actions/actions/prepare-node
+        with:
+          node-version: 14
+          cache-dependency-path: ./packages/github-actions/package-lock.json
+          install-deps: "no"
+
+      - name: Create and commit test build
+        run: |
+          REPO_URL="${{ github.server_url }}/${{ github.repository }}"
+          BRANCH_NAME="${{ github.ref_name }}"
+          TEST_BRANCH_NAME="${BRANCH_NAME}-test-build"
+
+          .github/scripts/github-actions-create-and-commit-build.sh "$REPO_URL" "$BRANCH_NAME"
+
+          # This `git checkout HEAD^` is to prevent errors from the post jobs like "Prepare node".
+          git checkout HEAD^ -- ./packages/github-actions/actions
+
+          # Set/update the test branch
+          git push --force origin "HEAD:refs/heads/${TEST_BRANCH_NAME}"
+
+          # Set summary
+          echo "### :link: The test build has been created" >> $GITHUB_STEP_SUMMARY
+          echo "${REPO_URL}/tree/${TEST_BRANCH_NAME}" >> $GITHUB_STEP_SUMMARY
+          echo "### :zap: Use the test build" >> $GITHUB_STEP_SUMMARY
+          echo "In the repo where you want to test custom actions with this test build, specify the \`uses\` with \`${{ github.repository }}/ACTION_PATH_TO_BE_TESTED@${TEST_BRANCH_NAME}\`." >> $GITHUB_STEP_SUMMARY