Initial mirror workflow

.forgejo/workflows/mirror-repository.yml

@@ -0,0 +1,51 @@
+on:
+  workflow_dispatch:
+
+  schedule:
+    - cron: '@hourly'
+
+jobs:
+  mirror:
+    name: Pull from upstream
+    runs-on: x86_64
+    container:
+      image: alpine:latest
+    env:
+      upstream: https://github.com/electron/electron
+      tags: 'v*'
+    steps:
+      - name: Environment setup
+        run: apk add grep git sed coreutils bash nodejs
+      - name: Fetch destination
+        uses: actions/checkout@v4
+        with:
+          fetch_depth: 1
+          ref: ci
+          token: ${{ secrets.CODE_FORGEJO_TOKEN }}
+      - name: Missing tag detecting
+        run: |
+          git ls-remote $upstream "refs/tags/$tags" | grep -v '{' | sed 's|.*/||' > upstream_tags
+          git ls-remote ${{ github.server_url}}/${{ github.repository }} "refs/tags/$tags" | grep -v '{' | sed 's|.*/||' > destination_tags
+          cat upstream_tags destination_tags | tr ' ' '\n' | sort | uniq -u > missing_tags
+          echo "Missing tags:"
+          cat missing_tags          
+      - name: Missing tag fetch
+        run: |
+          git remote add upstream $upstream
+          while read tag; do
+            git fetch upstream tag $tag --no-tags
+          done < missing_tags          
+      - name: Packaging workflow injection
+        run: |
+          while read tag; do
+            git checkout $tag
+            git tag -d $tag
+            git checkout ci -- ./.forgejo
+            git config user.name "forgejo-actions[bot]"
+            git config user.email "dev@ayakael.net"
+            git commit -m 'Inject custom workflow'
+            git tag -a $tag -m $tag
+          done < missing_tags          
+      - name: Push to destination
+        run: git push --force origin refs/tags/*:refs/tags/* --tags   
+