├── .github
    └── workflows
    │   └── dockerimage.yml
├── Dockerfile
└── README.md


/.github/workflows/dockerimage.yml:
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 1 | # Increase number to trigger CI -> 1
 2 | name: The showdown
 3 | on:
 4 |   push: {}
 5 | jobs:
 6 |   build_no_cache:
 7 |     runs-on: ubuntu-latest
 8 |     steps:
 9 |       - uses: actions/checkout@v2
10 |       - run: docker build . -t thing
11 |   build_no_cache_buildkit:
12 |     env:
13 |       DOCKER_BUILDKIT: '1'
14 |     runs-on: ubuntu-latest
15 |     steps:
16 |       - uses: actions/checkout@v2
17 |       - run: docker build . -t thing
18 |   build_with_docker_save_load:
19 |     runs-on: ubuntu-latest
20 |     steps:
21 |     - uses: actions/checkout@v2
22 |     - id: cache-docker
23 |       uses: actions/cache@v1
24 |       with:
25 |         path: /tmp/docker-save
26 |         key: docker-save-${{ hashFiles('Dockerfile') }}
27 |     - run: docker load -i /tmp/docker-save/snapshot.tar || true
28 |       if: steps.cache-docker.outputs.cache-hit == 'true'
29 |     - run: docker build . -t thing --cache-from=thing-cache
30 |     - run: docker tag thing thing-cache && mkdir -p /tmp/docker-save && docker save thing-cache -o /tmp/docker-save/snapshot.tar && ls -lh /tmp/docker-save || true
31 |       if: always() && steps.cache-docker.outputs.cache-hit != 'true'
32 |   build_with_local_registry:
33 |     runs-on: ubuntu-latest
34 |     steps:
35 |       - uses: actions/checkout@v2
36 |       - id: cache-docker
37 |         uses: actions/cache@v1
38 |         with:
39 |           path: /tmp/docker-registry
40 |           key: docker-registry-no-buildkit-${{ hashFiles('Dockerfile') }}
41 |       - run: docker run -d -p 5000:5000 --restart=always --name registry -v /tmp/docker-registry:/var/lib/registry registry:2 && npx wait-on tcp:5000
42 |       - run: docker pull localhost:5000/thing || true
43 |       - run: docker build . -t thing --cache-from=localhost:5000/thing
44 |       - run: docker tag thing localhost:5000/thing && docker push localhost:5000/thing || true
45 |         if: steps.cache.outputs.cache-hit != 'true'
46 |   build_with_local_registry_buildkit:
47 |     env:
48 |       DOCKER_BUILDKIT: '1'
49 |     runs-on: ubuntu-latest
50 |     steps:
51 |       - uses: actions/checkout@v2
52 |       - id: cache-docker
53 |         uses: actions/cache@v1
54 |         with:
55 |           path: /tmp/docker-registry
56 |           key: docker-registry-buildkit-${{ hashFiles('Dockerfile') }}
57 |       - run: docker run -d -p 5000:5000 --restart=always --name registry -v /tmp/docker-registry:/var/lib/registry registry:2 && npx wait-on tcp:5000
58 |       - run: docker build . -t thing --cache-from=localhost:5000/thing --build-arg BUILDKIT_INLINE_CACHE=1
59 |       - run: docker tag thing localhost:5000/thing && docker push localhost:5000/thing || true
60 |         if: steps.cache.outputs.cache-hit != 'true'
61 |   build_with_gpr:
62 |     runs-on: ubuntu-latest
63 |     steps:
64 |       - uses: actions/checkout@v2
65 |       - run: echo ${{ secrets.GITHUB_TOKEN }} | docker login docker.pkg.github.com -u $GITHUB_ACTOR --password-stdin
66 |       - run: docker pull docker.pkg.github.com/$GITHUB_REPOSITORY/build-cache-no-buildkit || true
67 |       - run: docker build . -t thing --cache-from=docker.pkg.github.com/$GITHUB_REPOSITORY/build-cache-no-buildkit
68 |       - run: docker tag thing docker.pkg.github.com/$GITHUB_REPOSITORY/build-cache-no-buildkit && docker push docker.pkg.github.com/$GITHUB_REPOSITORY/build-cache-no-buildkit || true
69 | 


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/Dockerfile:
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 1 | FROM node:12
 2 | RUN yarn create react-app my-react-app
 3 | RUN cd my-react-app && yarn build
 4 | RUN npm install -g @vue/cli && (yes | vue create my-vue-app --default)
 5 | RUN cd my-vue-app && yarn build
 6 | RUN mkdir -p my-tests && cd my-tests && yarn add playwright
 7 | # test
 8 | # test
 9 | # test
10 | # test
11 | # test
12 | # test
13 | # test
14 | # test
15 | # test
16 | # test
17 | 


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/README.md:
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1 | # github-actions-docker-layer-caching-poc
2 | 
3 | Some analysis to find out what approach of caching Docker builds leads to most performance gain.


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