ci: push to ghcr.io using version tag (#27)

Author: mariatsji

.github/workflows/ci.yml

@@ -2,6 +2,8 @@ name: CI
 
 on:
   push:
+    branches:
+      - main
     tags:
       - v*
   pull_request: {}
@@ -63,7 +65,6 @@ jobs:
       matrix:
         arch:
           - amd64
-          - arm64
     steps:
       - name: Setup QEMU
         uses: docker/setup-qemu-action@v3
@@ -107,6 +108,9 @@ jobs:
       - name: Build Package
         run: ./crossplane xpkg build --package-file=${{ matrix.arch }}.xpkg --package-root=package/ --embed-runtime-image-tarball=runtime-${{ matrix.arch }}.tar
 
-      - name: Upload Package
-        if: ${{ steps.release.outputs.release_created }}
-        run: ./crossplane xpkg push -f ${{ matrix.arch }}.xpkg  ghcr.io/statnett/function-s3-user-arn:${{ steps.release.outputs.tag_name }}
+      - name: Extract version from tag
+        run: echo "TAG=$(basename $GITHUB_REF_NAME)" >> $GITHUB_ENV
+
+      - name: Push Crossplane Package
+        if: startsWith(github.ref, 'refs/tags/v')
+        run: ./crossplane xpkg push -f ${{ matrix.arch }}.xpkg ghcr.io/statnett/function-s3-user-arn-${{ matrix.arch }}:${{ env.TAG }}