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Test before pushing your image (docs)
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# Test your image before pushing it | ||
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In some cases, you might want to validate that the image works as expected | ||
before pushing it. | ||
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The workflow below will be composed of several steps to achieve this: | ||
* Build and export the image to Docker | ||
* Test your image | ||
* Multi-platform build and push the image | ||
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```yaml | ||
name: ci | ||
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on: | ||
push: | ||
branches: | ||
- 'master' | ||
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env: | ||
TEST_TAG: user/myapp:test | ||
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jobs: | ||
docker: | ||
runs-on: ubuntu-latest | ||
steps: | ||
- | ||
name: Checkout | ||
uses: actions/checkout@v2 | ||
- | ||
name: Set up QEMU | ||
uses: docker/setup-qemu-action@v1 | ||
- | ||
name: Set up Docker Buildx | ||
uses: docker/setup-buildx-action@v1 | ||
- | ||
name: Login to DockerHub | ||
uses: docker/login-action@v1 | ||
with: | ||
username: ${{ secrets.DOCKERHUB_USERNAME }} | ||
password: ${{ secrets.DOCKERHUB_TOKEN }} | ||
- | ||
name: Build and export to Docker | ||
uses: docker/build-push-action@v2 | ||
with: | ||
context: . | ||
load: true | ||
tags: ${{ env.TEST_TAG }} | ||
- | ||
name: Test | ||
run: | | ||
docker run --rm ${{ env.TEST_TAG }} | ||
- | ||
name: Build and push | ||
uses: docker/build-push-action@v2 | ||
with: | ||
context: . | ||
platforms: linux/amd64,linux/arm64 | ||
push: true | ||
tags: user/app:latest | ||
``` | ||
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> :bulb: Build time will not be increased with this workflow because internal | ||
> cache for `linux/amd64` will be used from previous step on `Build and push` | ||
> step so only `linux/arm64` will be actually built. |