Task A-5: Added reusable workflow

Storing a reusable workflow in the e-mission-server repo. Can decide where to place it in a central location.
https://docs.github.com/en/actions/sharing-automations/reusing-workflows

It essentially works like a function call in normal programming.
The advantage is that we have no repeated code the image build process.
All the other repos (join, admin-dash, public-dash) reuse the same workflow file.

Additionally, on for future GitHub actions, workflow file related changes, will no longer need to have 3 additional PRs for each repo (join, admin-dash, public-dash). Can simply modify the reusable workflow file as this is the core “function” workflow that is being called.

I have added conditional checks that check for the repo name in the reusable workflow file that determine which statements to execute depending on for which repo the workflow is running.

This is used for both push events specific to a repo as well as for the workflow dispatch events triggered on pushes to server repo.

.github/workflows/image_build_push.yml

@@ -4,59 +4,11 @@ on:
   push:
     branches: [ main ]
 
-env:
-  DOCKER_USER: ${{secrets.DOCKER_USER}}
-  DOCKER_PASSWORD: ${{secrets.DOCKER_PASSWORD}}
-
 jobs:
-
-  build:
-
-    runs-on: ubuntu-latest
-
-    steps:
-
-    - uses: actions/checkout@v2
-
-    - name: Set docker image tags
-      id: set-tags
-      run: |
-        set -a; source .env; set +a
-        echo "JOIN_IMAGE_TAG=${JOIN_IMAGE_TAG}" >> "$GITHUB_OUTPUT"
-        echo "Current join-page image tag (push): ${JOIN_IMAGE_TAG}"
-
-    - name: docker login
-      run: | # log into docker hub account
-        docker login -u $DOCKER_USER -p $DOCKER_PASSWORD
-
-    - name: Get current date # get the date of the build
-      id: date
-      run: echo "date=$(date +'%Y-%m-%d--%M-%S')" >> "$GITHUB_OUTPUT"
-
-    - name: Run a one-line script
-      run: echo running in repo ${GITHUB_REPOSITORY#*/} branch ${GITHUB_REF##*/} on ${{ steps.date.outputs.date }}
-
-    - name: build docker image
-      run: |
-        docker build -t $DOCKER_USER/${GITHUB_REPOSITORY#*/}:${GITHUB_REF##*/}_${{ steps.date.outputs.date }} ./frontend
-        docker images
-
-    - name: push docker image
-      run: |
-        docker push $DOCKER_USER/${GITHUB_REPOSITORY#*/}:${GITHUB_REF##*/}_${{ steps.date.outputs.date }}
-
-    - name: Update .env file 
-      run: |
-        echo "JOIN_IMAGE_TAG=${GITHUB_REF##*/}_${{ steps.date.outputs.date }}" > .env
-
-    - name: Add, Commit, Push changes to .env file
-      run: |
-        git config --local user.email "[email protected]"
-        git config --local user.name "Github Actions bot to update .env with latest tags"
-        if git diff --quiet; then
-          echo "Latest timestamp already present in .env file, no changes to commit"
-        else
-          git add .env
-          git commit -m "Updated docker image tags in .env file to the latest timestamp"
-          git push origin 
-        fi
+  build:  
+    if: ${{ !contains(github.event.head_commit.author.name, 'Github Actions bot to update .env with latest tags') }}
+    uses: e-mission/e-mission-server/.github/workflows/reusable_image_build_push.yml@master
+    with:
+      repo: ${{ github.event.repository.name }}
+      branch: ${{ github.ref_name }}
+    secrets: inherit