Update

Author: satackey

.github/workflows/release.yml

@@ -39,6 +39,7 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
+    - run: docker-compose -f test_project/docker-compose.yml -p test_project pull
 
     - name: Extract
       id: extract
@@ -66,6 +67,7 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
+    - run: docker-compose -f test_project/docker-compose.yml -p test_project pull
 
     - name: Extract
       id: extract
@@ -81,7 +83,6 @@ jobs:
     - uses: ./action-dlc
       name: Run satackey/action-docker-layer-caching@${{ steps.extract.outputs.branch }}
       with:
-        # repotag: test_project_node
         key: docker-layer-caching-test_project_node-sha:${{ github.sha }}-{hash}
         restore-keys: docker-layer-caching-test_project_node-sha:${{ github.sha }}-
 
@@ -117,8 +118,6 @@ jobs:
     - build_and_push
 
     steps:
-    - uses: actions/checkout@v2
-
     - name: Extract
       id: extract
       run: |

.github/workflows/test_readme.yml

@@ -13,7 +13,9 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
+    - run: docker-compose -f test_project/docker-compose.yml -p test_project pull
     - uses: satackey/action-docker-layer-caching@v0.0
+    - run: docker rmi $(docker image ls -q)
     - run: docker-compose -f test_project/docker-compose.yml -p test_project build --no-cache
 
   cached_build:
@@ -23,6 +25,7 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
+    - run: docker-compose -f test_project/docker-compose.yml -p test_project pull
     - uses: satackey/action-docker-layer-caching@v0.0
 
     - name: Get cached image ID

README.md

@@ -1,6 +1,9 @@
 # action-docker-layer-caching [![Readme Test](https://github.com/satackey/action-docker-layer-caching/workflows/Readme%20Test/badge.svg)](https://github.com/satackey/action-docker-layer-caching/actions?query=workflow%3A%22Readme+Test%22) [![CI](https://github.com/satackey/action-docker-layer-caching/workflows/CI/badge.svg)](https://github.com/satackey/action-docker-layer-caching/actions?query=workflow%3ACI)
 
-Enable docker layer caching by adding a single line.
+With only one additional line, you can enable Docker layer caching.
+
+You can use `docker build` and `docker-compose build` with the cache without any special configuration,
+and there is also support for multi-stage builds.
 
 ```yaml
 name: Readme Test
@@ -13,6 +16,26 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
-    - uses: satackey/action-docker-layer-caching@v0.0 # Images created after this action is called are cached.
+
+    # Avoid caching pull-only images.(docker pull is faster than caching.)
+    - run: docker-compose pull
+
+    # Images created after this action is called are cached.
+    - uses: satackey/action-docker-layer-caching@v0.0
     - run: docker-compose build
 ```
+
+---
+
+By default, the cache is separated by the name of the workflow.
+You can configure manually cache keys.
+
+```yaml
+    - uses: satackey/action-docker-layer-caching@v0.0
+      with:
+        key: foo-docker-cache-{hash}
+        restore-keys: |
+          foo-docker-cache-
+```
+
+**Note: You must include `{hash}` in the `key` input.** (`{hash}` will be replaced with the hash value of the docker image).

test_project/Dockerfile

@@ -1,5 +1,21 @@
+FROM node:12-alpine as curl-env
+RUN set -x \
+    apk update && \
+    apk add curl && \
+    mkdir -p /src && \
+    curl -o /src/install.sh -L https://yarnpkg.com/install.sh && \
+    chmod +x /src/install.sh && \
+    apk del curl
+
 FROM node:12-alpine
 
+COPY --from=curl-env /src/install.sh /tmp/install.sh
+RUN set -x \
+    apk update && \
+    apk add curl && \
+    /tmp/install.sh && \
+    apk del curl
+
 WORKDIR /app
 COPY package.json yarn.lock ./
 RUN yarn install --frozen-lockfile

test_project/docker-compose.yml

@@ -5,3 +5,5 @@ services:
     build:
       context: ../
       dockerfile: ./test_project/Dockerfile
+  mysql_pull_only:
+    image: mysql:8.0