Use variables for image versions

.github/workflows/test.yml

@@ -0,0 +1,30 @@
+# This is a basic workflow to help you get started with Actions
+
+name: Variable test
+
+env:
+  NEXTCLOUD_UPSTREAM_VERSION: 27.1.3
+  IMAGE_MAJOR_VERSION: 27
+
+# Controls when the workflow will run
+on:
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  variable_test:
+    runs-on: ubuntu-latest
+    
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Test image build
+        uses: VaultVulp/gp-docker-action@1.6.0
+        with:
+            github-token: ${{ secrets.GITHUB_TOKEN }}
+            image-name: nextcloud
+            extract-git-tag: false
+            additional-image-tags: ${{ env.IMAGE_MAJOR_VERSION }} ${{ env.NEXTCLOUD_UPSTREAM_VERSION }}
+            custom-args: --platform=linux/arm64,linux/amd64 --build-arg="NEXTCLOUD_UPSTREAM_VERSION=${{ env.NEXTCLOUD_UPSTREAM_VERSION }}"
+

Dockerfile

@@ -1,4 +1,5 @@
-FROM docker.io/library/nextcloud:27.1.3
+ARG NEXTCLOUD_UPSTREAM_VERSION=27.1.3
+FROM docker.io/library/nextcloud:${NEXTCLOUD_UPSTREAM_VERSION}
 
 RUN apt-get update && \
     apt-get install -y \