Use env for ci ghcr_image since vars is not accessible in PRs

Author: Donkie

.github/workflows/ci.yml

@@ -10,6 +10,9 @@ on:
     branches:
       - master
 
+env:
+  GHCR_IMAGE: donkie/spoolman
+
 jobs:
   #
   # Linting
@@ -128,20 +131,20 @@ jobs:
         uses: docker/[email protected]
         with:
           context: .
-          tags: ${{ vars.GHCR_IMAGE }}:test
+          tags: ${{ env.GHCR_IMAGE }}:test
           outputs: type=docker,dest=/tmp/spoolman.tar
-          cache-from: type=registry,ref=ghcr.io/${{ vars.GHCR_IMAGE }}:buildcache-amd64
-          cache-to: type=registry,ref=ghcr.io/${{ vars.GHCR_IMAGE }}:buildcache-amd64,mode=max
+          cache-from: type=registry,ref=ghcr.io/${{ env.GHCR_IMAGE }}:buildcache-amd64
+          cache-to: type=registry,ref=ghcr.io/${{ env.GHCR_IMAGE }}:buildcache-amd64,mode=max
 
       # Separate build for pull requests since PRs dont have access to store cache
       - name: Build Spoolman (PR)
         if: ${{ github.event_name == 'pull_request' }}
         uses: docker/[email protected]
         with:
           context: .
-          tags: ${{ vars.GHCR_IMAGE }}:test
+          tags: ${{ env.GHCR_IMAGE }}:test
           outputs: type=docker,dest=/tmp/spoolman.tar
-          cache-from: type=registry,ref=ghcr.io/${{ vars.GHCR_IMAGE }}:buildcache-amd64
+          cache-from: type=registry,ref=ghcr.io/${{ env.GHCR_IMAGE }}:buildcache-amd64
 
       - name: Upload artifact
         uses: actions/[email protected]
@@ -172,20 +175,20 @@ jobs:
         uses: docker/[email protected]
         with:
           context: ./tests_integration
-          tags: ${{ vars.GHCR_IMAGE }}-tester:latest
+          tags: ${{ env.GHCR_IMAGE }}-tester:latest
           outputs: type=docker,dest=/tmp/spoolman-tester.tar
-          cache-from: type=registry,ref=ghcr.io/${{ vars.GHCR_IMAGE }}:buildcache-tester
-          cache-to: type=registry,ref=ghcr.io/${{ vars.GHCR_IMAGE }}:buildcache-tester,mode=max
+          cache-from: type=registry,ref=ghcr.io/${{ env.GHCR_IMAGE }}:buildcache-tester
+          cache-to: type=registry,ref=ghcr.io/${{ env.GHCR_IMAGE }}:buildcache-tester,mode=max
 
       # Separate build for pull requests since PRs dont have access to store cache
       - name: Build Spoolman Tester (PR)
         if: ${{ github.event_name == 'pull_request' }}
         uses: docker/[email protected]
         with:
           context: ./tests_integration
-          tags: ${{ vars.GHCR_IMAGE }}-tester:latest
+          tags: ${{ env.GHCR_IMAGE }}-tester:latest
           outputs: type=docker,dest=/tmp/spoolman-tester.tar
-          cache-from: type=registry,ref=ghcr.io/${{ vars.GHCR_IMAGE }}:buildcache-tester
+          cache-from: type=registry,ref=ghcr.io/${{ env.GHCR_IMAGE }}:buildcache-tester
 
       - name: Upload artifact
         uses: actions/[email protected]
@@ -259,8 +262,8 @@ jobs:
         with:
           context: .
           platforms: linux/arm64
-          cache-from: type=registry,ref=ghcr.io/${{ vars.GHCR_IMAGE }}:buildcache-arm64
-          cache-to: type=registry,ref=ghcr.io/${{ vars.GHCR_IMAGE }}:buildcache-arm64,mode=max
+          cache-from: type=registry,ref=ghcr.io/${{ env.GHCR_IMAGE }}:buildcache-arm64
+          cache-to: type=registry,ref=ghcr.io/${{ env.GHCR_IMAGE }}:buildcache-arm64,mode=max
   #
   # Build arm/v7 image
   # Don't run this for pull requests
@@ -298,8 +301,8 @@ jobs:
         with:
           context: .
           platforms: linux/arm/v7
-          cache-from: type=registry,ref=ghcr.io/${{ vars.GHCR_IMAGE }}:buildcache-armv7
-          cache-to: type=registry,ref=ghcr.io/${{ vars.GHCR_IMAGE }}:buildcache-armv7,mode=max
+          cache-from: type=registry,ref=ghcr.io/${{ env.GHCR_IMAGE }}:buildcache-armv7
+          cache-to: type=registry,ref=ghcr.io/${{ env.GHCR_IMAGE }}:buildcache-armv7,mode=max
   #
   # Release images GHCR and Docker Hub if tests pass
   # Don't run this for pull requests
@@ -336,7 +339,7 @@ jobs:
         uses: docker/[email protected]
         with:
           images: |
-            ghcr.io/${{ vars.GHCR_IMAGE }}
+            ghcr.io/${{ env.GHCR_IMAGE }}
           tags: |
             type=edge
             type=semver,pattern={{version}}
@@ -381,9 +384,9 @@ jobs:
             GIT_COMMIT
             BUILD_DATE
           cache-from: |
-            type=registry,ref=ghcr.io/${{ vars.GHCR_IMAGE }}:buildcache-amd64
-            type=registry,ref=ghcr.io/${{ vars.GHCR_IMAGE }}:buildcache-arm64
-            type=registry,ref=ghcr.io/${{ vars.GHCR_IMAGE }}:buildcache-armv7
+            type=registry,ref=ghcr.io/${{ env.GHCR_IMAGE }}:buildcache-amd64
+            type=registry,ref=ghcr.io/${{ env.GHCR_IMAGE }}:buildcache-arm64
+            type=registry,ref=ghcr.io/${{ env.GHCR_IMAGE }}:buildcache-armv7
   #
   # Create Github Release if CI was triggered by a tag
   #