Add GitHub Action to publish to AUR on version tag

.github/workflows/publish-aur.yml

@@ -0,0 +1,63 @@
+name: Publish to AUR
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Extract version from tag
+        id: version
+        run: echo "version=${GITHUB_REF_NAME#v}" >> "$GITHUB_OUTPUT"
+
+      - name: Compute sha256 of GitHub tarball
+        id: sha256
+        run: |
+          URL="https://github.com/${{ github.repository }}/archive/refs/tags/${GITHUB_REF_NAME}.tar.gz"
+          SHA=$(curl -sL "$URL" | sha256sum | awk '{print $1}')
+          echo "sha256=$SHA" >> "$GITHUB_OUTPUT"
+
+      - name: Update PKGBUILD version and checksum
+        run: |
+          VERSION="${{ steps.version.outputs.version }}"
+          SHA="${{ steps.sha256.outputs.sha256 }}"
+          sed -i "s/^pkgver=.*/pkgver=${VERSION}/" PKGBUILD
+          sed -i "s/^pkgrel=.*/pkgrel=1/" PKGBUILD
+          sed -i "s/^sha256sums=.*/sha256sums=('${SHA}')/" PKGBUILD
+
+      - name: Generate .SRCINFO
+        uses: docker://archlinux:latest
+        with:
+          args: bash -c "pacman -Sy --noconfirm pacman && makepkg --printsrcinfo > .SRCINFO"
+
+      - name: Set up SSH for AUR
+        run: |
+          mkdir -p ~/.ssh
+          echo "${{ secrets.AUR_SSH_KEY }}" > ~/.ssh/aur
+          chmod 600 ~/.ssh/aur
+          ssh-keyscan aur.archlinux.org >> ~/.ssh/known_hosts
+          cat >> ~/.ssh/config <<EOF
+          Host aur.archlinux.org
+            IdentityFile ~/.ssh/aur
+            User aur
+          EOF
+
+      - name: Clone AUR repo
+        run: git clone ssh://aur@aur.archlinux.org/${{ github.event.repository.name }}.git /tmp/aur-pkg
+
+      - name: Copy files and push to AUR
+        run: |
+          cp PKGBUILD .SRCINFO /tmp/aur-pkg/
+          cd /tmp/aur-pkg
+          git config user.name "github-actions"
+          git config user.email "github-actions@github.com"
+          git add PKGBUILD .SRCINFO
+          git commit -m "Update to ${{ github.ref_name }}"
+          git push