Merge pull request #32 from b4tman/update-ci

Update ci

.github/workflows/dockerimage.yml

@@ -14,9 +14,18 @@ jobs:
 
   build:
  
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
  
     steps:
-    - uses: actions/checkout@v1
-    - name: Build the Docker image
-      run: docker build . --file Dockerfile --tag b4tman/armhf-alpine-qemu:$(date +%s)
+    - uses: actions/checkout@v2
+    - name: Build image
+      uses: docker/build-push-action@v2
+      with:
+        context: .
+        push: false
+        tags: b4tman/armhf-alpine-qemu:test
+        outputs: type=image,name=b4tman/armhf-alpine-qemu:test,push=false
+    - name: Test image
+      env:
+        DOCKER_BUILDKIT: 0
+      run: docker build --force-rm -t tmp/test1 -f test/Dockerfile test

test/Dockerfile

@@ -0,0 +1,8 @@
+FROM b4tman/armhf-alpine-qemu:test
+
+RUN [ "cross-build-start" ]
+
+RUN sh -exc "[ \"armv7l\" = `uname -m` ]"
+
+RUN [ "cross-build-end" ]
+