build-push-action/docs/advanced/test-before-push.md

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# Test your image before pushing it
In some cases, you might want to validate that the image works as expected
before pushing it.
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
```yaml
name: ci
on:
push:
branches:
- 'master'
env:
TEST_TAG: user/myapp:test
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
```
> :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.