Docker build and push using github: invalid reference format - docker

Question

I want to build my image and push it to dockerhub using github actions.This is my repo
And this is how I want to do my job:
name: ci
on:
push:
branches:
- 'master'
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_PASSWORD }}
-
name: Build and push
uses: docker/build-push-action#v2
with:
context: .
load: true
tags: shirzadi/ehsan:latest
-
name: Push it!
run: docker push ${{ env.IMAGE }}:${{ env.GIT_SHA }}
And this is the result:

Answer 1

You are using environment variables that don't exist. According to docker/build-push-action#v2 documentation it can build, tag and push your image in a single step:
jobs:
docker:
steps:
# ...
-
name: Build and push
uses: docker/build-push-action#v2
with:
context: .
push: true
tags: shirzadi/ehsan:latest,shirzadi/ehsan:${{ env.GITHUB_SHA }}
The tags key lists 2 tags and use the GITHUB_SHA environment variable. These tags will be pushed as the push key is set to true.
See:
Github Actions - Default environment variables
docker/build-push-action#v2 - customizing inputs

Answer 2

You are not having env.IMAGE data. Below piece of code should do the job.
- name: Build and push
run: docker build -t ${{ env.IMAGE }}:${{ github.sha }} .
env:
IMAGE: shirzadi/ehsan
- name: Push it!
run: docker push ${{ env.IMAGE }}:${{ github.sha }}
env:
IMAGE: shirzadi/ehsan