ci: separate build/push image to fix permission issue

.github/workflows/build-app.yaml

@@ -0,0 +1,18 @@
+---
+name: Build App
+on:
+  workflow_call
+
+permissions:
+  contents: read
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-java@v3
+        with:
+          java-version: '17'
+          distribution: 'temurin'
+          cache: maven
+      - run: mvn --batch-mode --update-snapshots verify

.github/workflows/ci.yml

@@ -6,5 +6,17 @@ on:
 permissions:
   contents: read
 jobs:
+  build-app:
+    uses: ./.github/workflows/build-app.yaml
   build-image:
-    uses: ./.github/workflows/build-image.yml
+    runs-on: ubuntu-latest
+    needs:
+      - build-app
+    steps:
+      - uses: docker/setup-qemu-action@v3
+      - uses: docker/setup-buildx-action@v3
+      - uses: docker/build-push-action@v5
+        with:
+          context: .
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

.github/workflows/main.yml

@@ -9,12 +9,48 @@ on:
 
 permissions:
   contents: read
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
 jobs:
+  build-app:
+    uses: ./.github/workflows/build-app.yaml
   build-push-image:
     if: ${{ github.repository == 'statnett/k3a-lag-exporter' }}
+    needs:
+      - build-app
+    runs-on: ubuntu-latest
     permissions:
       contents: read
       packages: write
-    uses: ./.github/workflows/build-image.yml
-    with:
-      push: true
+    steps:
+      - uses: docker/setup-qemu-action@v3
+      - uses: docker/setup-buildx-action@v3
+      - uses: docker/metadata-action@v5
+        id: meta
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            # output 0.1.2
+            type=semver,pattern={{version}}
+            # output 0.1
+            type=semver,pattern={{major}}.{{minor}}
+            # disabled if major zero
+            type=semver,pattern={{major}},enable=${{ !startsWith(github.ref, 'refs/tags/v0.') }}
+            # set latest tag for default branch
+            type=raw,value=latest,enable={{is_default_branch}}
+            type=ref,event=branch
+            type=ref,event=pr
+      - uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max