Fix apk-publish workflow: create source tarball from local git checkout

.gitea/workflows/apk-publish.yml

@@ -36,8 +36,15 @@ jobs:
         run: |
           cd packaging/alpine
           pkgver=$(echo "${{ github.ref_name }}" | sed 's/^v//')
+          pkgname="axolotl"
+          
           sed -i "s/pkgver=.*/pkgver=$pkgver/" APKBUILD
-          sed -i "s|source=.*|source=\"\$pkgname-\$pkgver.tar.gz::${{ github.server_url }}/${{ github.repository }}/archive/\$pkgver.tar.gz\"|" APKBUILD
+          
+          mkdir -p /tmp/distfiles
+          cd ../..
+          git archive --format=tar.gz --prefix="$pkgname-$pkgver/" -o "/tmp/distfiles/$pkgname-$pkgver.tar.gz" HEAD
+          
+          sed -i "s|source=.*|source=\"/tmp/distfiles/\$pkgname-\$pkgver.tar.gz\"|" packaging/alpine/APKBUILD
           chown -R build:abuild .
       
       - name: Generate checksums