feat(workflow): started to write a script to automate the repo update and release cycle

.github/workflows/publish_release.yaml

@@ -0,0 +1,90 @@
+name: Check and Publish New XRoar Release
+
+on:
+    workflow_dispatch:
+    schedule:
+        - cron: '0 6 * * *' # Runs daily at 6:00 UTC
+
+jobs:
+    check-xroar-release:
+        runs-on: ubuntu-latest
+        steps:
+            - name: 'Checkout repository'
+              uses: actions/checkout@v4
+
+            - name: 'Get latest GitHub release tag'
+              id: get_latest_release
+              uses: actions/github-script@v7
+              with:
+                  script: |
+                      const releases = await github.rest.repos.listReleases({
+                          owner: context.repo.owner,
+                          repo: context.repo.repo,
+                          per_page: 1
+                        });
+                        if (releases.data.length === 0) {
+                            core.setFailed('No releases found');
+                        } else {
+                            const tag = releases.data[0].tag_name;
+                            core.setOutput('tag', tag);
+                        }
+
+            - name: 'Fetch XRoar website'
+              id: fetch_xroar_page
+              run: |
+                  curl -sSL https://www.6809.org.uk/xroar/ > xroar_page.html
+
+            - name: 'Extract version from XRoar page'
+              id: extract_version
+              run: |
+                  version=$(grep -oP 'Source code version \K[0-9]+\.[0-9]+\.[0-9]+' xroar_page.html | head -n1)
+                  echo "version=$version" >> $GITHUB_OUTPUT
+
+            - name: 'Compare versions'
+              id: compare_versions
+              run: |
+                  latest_tag="${{ steps.get_latest_release.outputs.tag }}"
+                  web_version="${{ steps.extract_version.outputs.version }}"
+                  echo "Latest tag: $latest_tag"
+                  echo "Web version: $web_version"
+                  if [[ "$latest_tag" == "$web_version" ]]; then
+                      echo "No new version found."
+                      echo "update_needed=false" >> $GITHUB_OUTPUT
+                  else
+                      echo "New version detected."
+                      echo "update_needed=true" >> $GITHUB_OUTPUT
+                  fi
+
+            - name: 'Extract download link from XRoar page'
+              if: steps.compare_versions.outputs.update_needed == 'true'
+              id: extract_download_link
+              run: |
+                  version="${{ steps.extract_version.outputs.version }}"
+                  url=$(grep -oP "https://www.6809.org.uk/xroar/dl/xroar-${version}\.tar\.gz" xroar_page.html | head -n1)
+                  if [ -z "$url" ]; then
+                      echo "Download link not found"
+                      exit 1
+                  fi
+                  echo "url=$url" >> $GITHUB_OUTPUT
+
+            - name: 'Download and extract new source'
+              if: steps.compare_versions.outputs.update_needed == 'true'
+              run: |
+                  url="${{ steps.extract_download_link.outputs.url }}"
+                  curl -sSL "$url" -o xroar.tar.gz
+                  tar -xzf xroar.tar.gz --strip-components=1
+
+            - name: 'Commit and push updated source'
+              if: steps.compare_versions.outputs.update_needed == 'true'
+              run: |
+                  git config --global user.name "github-actions[bot]"
+                  git config --global user.email "github-actions[bot]@users.noreply.github.com"
+                  git checkout -b "update-xroar-${{ steps.extract_version.outputs.version }}"
+                  git add .
+                  git commit -m "Update XRoar source to version ${{ steps.extract_version.outputs.version }}"
+                  git push --set-upstream origin "update-xroar-${{ steps.extract_version.outputs.version }}"
+
+            - name: 'Build XRoar (placeholder)'
+              if: steps.compare_versions.outputs.update_needed == 'true'
+              run: |
+                  echo "TODO: Add build steps here"