Add monthly iso build workflow that can be triggered manually

.gitea/workflows/build-iso.yaml

@@ -0,0 +1,74 @@
+name: Scheduled ArchISO Build
+
+on:
+  schedule:
+    - cron: "0 0 1 * *" # Runs monthly on the 1st day of the month
+  workflow_dispatch: # Allows manual triggers (multiple times a month)
+
+jobs:
+  build:
+    runs-on: ubuntu-latest # Ensure this runner has archiso capabilities
+    permissions:
+      contents: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Install archiso and dependencies
+        run: |
+          sudo pacman -Syu --noconfirm archiso
+
+      - name: Build Arch ISO
+        run: |
+          # Replace 'releng' with your custom profile directory if needed
+          sudo mkarchiso -v -w work -o out/ releng
+
+      - name: Generate Unique Dynamic Tag
+        id: tag
+        env:
+          GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}
+          SERVER_URL: ${{ github.server_url }}
+          REPOSITORY: ${{ github.repository }}
+        run: |
+          BASE_DATE=$(date -u +'%Y.%m.%d')
+          REVISION=1
+          TAG_NAME="iso-${BASE_DATE}-r${REVISION}"
+
+          # Check if the tag already exists via Gitea API, increment revision loop if it does
+          while curl -s -o /dev/null -w "%{http_code}" -H "Authorization: token $GITEA_TOKEN" \
+            "$SERVER_URL/api/v1/repos/$REPOSITORY/releases/tags/$TAG_NAME" | grep -q "200"; do
+              REVISION=$((REVISION + 1))
+              TAG_NAME="iso-${BASE_DATE}-r${REVISION}"
+          done
+
+          echo "tag_name=${TAG_NAME}" >> $GITHUB_OUTPUT
+          echo "release_name=Arch Linux ISO (${BASE_DATE} Rev ${REVISION})" >> $GITHUB_OUTPUT
+
+      - name: Create Release and Upload ISO
+        uses: softprops/action-gh-release@v1
+        with:
+          tag_name: ${{ steps.tag.outputs.tag_name }}
+          name: ${{ steps.tag.outputs.release_name }}
+          files: out/*.iso
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITEA_TOKEN }}
+
+      - name: Keep only latest 3 releases
+        env:
+          GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}
+          SERVER_URL: ${{ github.server_url }}
+          REPOSITORY: ${{ github.repository }}
+        run: |
+          # Fetch all releases
+          releases=$(curl -s -H "Authorization: token $GITEA_TOKEN" \
+            "$SERVER_URL/api/v1/repos/$REPOSITORY/releases")
+
+          # Sort by creation date and delete old ones, keeping only the 3 newest releases
+          echo "$releases" | jq -r 'sort_by(.created_at) | .[].id' | head -n -3 | while read -r id; do
+            if [ -n "$id" ]; then
+              echo "Deleting old release ID: $id"
+              curl -s -X DELETE -H "Authorization: token $GITEA_TOKEN" \
+                "$SERVER_URL/api/v1/repos/$REPOSITORY/releases/$id"
+            fi
+          done