Docker build fails in GH Actions - docker

Question

I want to run some NPM scripts, create a docker image and publish it on dockerhub.
I get this error trying to generate the image. It seems the second job doesn't see the build directory.
COPY failed: file not found in build context or excluded by .dockerignore: stat build/: file does not exist
Dockerfile
FROM httpd:2.4-alpine
COPY ./build/ /usr/local/apache2/htdocs/myapp/
EXPOSE 80
this is my workflow
name: CD
on:
push:
branches: [ main ]
jobs:
build:
name: App build
runs-on: ubuntu-18.04
steps:
- uses: actions/checkout#v2
- name: Npm install
run: npm install
- name: Npm build
run: npm run build
deploy:
name: Docker image in DockerHub repository
runs-on: ubuntu-18.04
needs: build
steps:
- uses: actions/checkout#v2
- name: LS
run: ls -R
- name: Login to dockerhub
run: docker login -u ${{ secrets.DOCKER_HUB_USER }} -p ${{ secrets.DOCKER_HUB_PASSWORD }}
- name: Build Docker image
run: docker build -f ./Dockerfile -t myaccount/myapp .
- name: Push Docker image to DockerHub
run: docker push myaccount/myapp:latest
Project structure
| Dockerfile
| package.json
| README.md
| webpack.config.js
+---.github
| \---workflows
| deploy.yml
+---build
+---src
Update: I changed my workflow to ls the whole GITHUB_WORKSPACE.
build dir is actually missing (the other files are there). Yet, the build process (the first job) ends without errors, and if I try to ls -R in the first job the build dir is there. It is missing in the second job.
It seems the state of the workspace at the end of the first job is not available to the second job.

Answer 1

It seems for that you need actions/upload-artifact and actions/download-artifact.
name: CD
on:
push:
branches: [ main ]
jobs:
build:
name: App build
runs-on: ubuntu-18.04
steps:
- uses: actions/checkout#v2
- name: Npm install
run: npm install
- name: Npm build
run: npm run build
- name: LS
run: ls -R
- name: Temporarily save webpack artifact
uses: actions/upload-artifact#v2
with:
name: webpack-artifact
path: build
retention-days: 1
deploy:
name: Docker image in DockerHub repository
runs-on: ubuntu-18.04
needs: build
steps:
## Build and deploy Docker images to DockerHub
- uses: actions/checkout#v2
- name: Retrieve built package
uses: actions/download-artifact#v2
with:
name: webpack-artifact
path: build
- name: LS
run: ls -R
- name: Login to dockerhub
run: docker login -u ${{ secrets.DOCKER_HUB_USER }} -p ${{ secrets.DOCKER_HUB_PASSWORD }}
- name: Build Docker image
run: docker build -f ./Dockerfile -t myaccount/myapp ./
- name: Push Docker image to DockerHub
run: docker push myaccount/myapp:latest

Answer 2

2 jobs in Github Actions are run on 2 separate machines, so the second job cannot see the first one. The solution is to put them into one job.
name: CD
on:
push:
branches: [ main ]
jobs:
deploy:
name: Docker image in DockerHub repository
runs-on: ubuntu-18.04
steps:
- uses: actions/checkout#v2
- name: Npm install
run: npm install
- name: Npm build
run: npm run build
- name: LS
run: ls -R
- name: Login to dockerhub
run: docker login -u ${{ secrets.DOCKER_HUB_USER }} -p ${{ secrets.DOCKER_HUB_PASSWORD }}
- name: Build Docker image
run: docker build -f ./Dockerfile -t myaccount/myapp .
- name: Push Docker image to DockerHub
run: docker push myaccount/myapp:latest