chore: automate post-release updates using ci (#538)

It just automates the post-release updates needed after every release, like documentation and installer script updates, as well as checksum generation.

.github/workflows/release.updates.yml

@@ -3,12 +3,15 @@ on:
   release:
     types:
       - published
+
 permissions:
   contents: write
+  pull-requests: write
 
 jobs:
-  checksum_file:
+  release_updates:
     runs-on: ubuntu-22.04
+    environment: release-updates-static-web-server
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -18,8 +21,9 @@ jobs:
       - name: Prepare
         shell: bash
         run: |
-          echo "SERVER_VERSION=${GITHUB_REF#refs/tags/}" >> $GITHUB_ENV
-          echo "version is: ${{ env.SERVER_VERSION }}"
+          echo "RELEASE_VERSION=${GITHUB_REF#refs/tags/}" >> $GITHUB_ENV
+          echo "version is: ${{ env.RELEASE_VERSION }}"
+          echo "PR_BRANCH_NAME=release-docs-${{ env.RELEASE_VERSION }}-$(date -u '+%d-%m-%Y')" >> $GITHUB_ENV
 
       - name: Post release updates
         shell: bash
@@ -29,17 +33,30 @@ jobs:
         run: |
           scripts/ci/post_release_updates.sh
 
-      - name: Commit post release updates changes
+      - name: Commit post release updates
         shell: bash
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
           git config --global user.name 'github-actions[bot]'
           git config --global user.email '41898282+github-actions[bot]@users.noreply.github.com'
+
           git add scripts/installer.sh
           git add docs/content/download-and-install.md
           git add docs/content/download-and-install.template.md
-          git commit --verbose -m "docs: ${{ env.SERVER_VERSION }} [skip ci]"
-          git fetch origin
-          git rebase --strategy-option=theirs origin/master --verbose
-          git push --verbose
+
+          git commit --verbose -m "docs: ${{ env.RELEASE_VERSION }} [skip ci]"
+          git checkout -b ${{ env.PR_BRANCH_NAME }}
+          git push --set-upstream origin --verbose ${{ env.PR_BRANCH_NAME }}
+
+      - name: Create pull request for release updates
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          gh pr create \
+            --title "Post release ${{ env.RELEASE_VERSION }} updates" \
+            --body "An automated PR containing documentation and script installer updates corresponding to the current release \`${{ env.RELEASE_VERSION }}\`.\n\nSee https://static-web-server.net/download-and-install/ for more details." \
+            --base "master" \
+            --head "${{ env.PR_BRANCH_NAME }}" \
+            --label "v2" --label "enhancement" --label "documentation" --label "automated" \
+            --draft