Add continuous deployment to Dash server

.github/workflows/deploy.yaml

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+name: reusable deployment workflow
+
+on:
+  workflow_call:
+    secrets:
+      DASH_SSH_KEY:
+        required: true
+      DASH_ENTERPRISE_URL:
+        required: true
+      APP_NAME:
+        required: true
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "deploy"
+  deploy:
+    # The type of runner that the job will run on
+    runs-on: ubuntu-22.04
+    steps:
+      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: Add git remote
+        run: git remote add plotly git@$DASH_ENTERPRISE_URL:$APP_NAME
+        env:
+          DASH_ENTERPRISE_URL: ${{secrets.DASH_ENTERPRISE_URL}}
+          APP_NAME: ${{secrets.APP_NAME}}
+      - name: Setup project directory
+        run: |
+          set -x
+          pwd
+          ls -al
+          mkdir -p /home/runner/.ssh
+      - name: Setup SSH key
+        run: |
+          echo "$SSH_PRIVATE_KEY" > ~/.ssh/id_rsa
+          chmod 600 ~/.ssh/id_rsa # permissioning
+          eval "$(ssh-agent -s)" # setting ssh environment variable
+          ssh-add ~/.ssh/id_rsa
+          echo "Host *
+              Port 22
+              StrictHostKeyChecking no
+              UserKnownHostsFile=/dev/null" > ~/.ssh/config
+        env:
+          SSH_PRIVATE_KEY: ${{secrets.DASH_SSH_KEY}}
+      - name: Deploy
+        run: |
+          git push --force plotly HEAD:refs/heads/master

.github/workflows/prod-deploy.yml

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+name: production deployment
+
+on:
+  push:
+    branches: [main]
+
+jobs:
+  prod-deploy:
+    uses: ./.github/workflows/deploy.yml
+    secrets:
+      DASH_SSH_KEY: ${{secrets.DASH_SSH_KEY}}
+      APP_NAME: ${{secrets.APP_NAME}}
+      DASH_ENTERPRISE_URL: ${{secrets.DASH_ENTERPRISE_URL}}

.github/workflows/staging-deploy.yml

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+name: staging deployment
+
+on: pull_request
+
+jobs:
+  test-and-lint:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: Set up Python 3.9.16
+        uses: actions/setup-python@v3
+        with:
+          python-version: '3.9.16'
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+      - name: Lint with flake8
+        run: |
+          # stop the build if there are Python syntax errors or undefined names
+          flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
+          # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
+          flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+      - name: Test formatting with black
+        run: |
+          black . --check
+  staging-deploy:
+    needs: test-and-lint
+    uses: ./.github/workflows/deploy.yml
+    secrets:
+      DASH_SSH_KEY: ${{secrets.DASH_SSH_KEY}}
+      APP_NAME: ${{secrets.APP_NAME}}-staging
+      DASH_ENTERPRISE_URL: ${{secrets.DASH_ENTERPRISE_URL}}
+  comment-deploy-link:
+    needs: staging-deploy
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Check for existing comment
+        uses: peter-evans/find-comment@v1
+        id: fc
+        with:
+          issue-number: ${{ github.event.pull_request.number }}
+          comment-author: 'github-actions[bot]'
+      - name: Post comment
+        if: steps.fc.outputs.comment-id == ''
+        uses: peter-evans/create-or-update-comment@v1
+        with:
+          issue-number: ${{ github.event.pull_request.number }}
+          body: |
+            Staging application has been deployed and is available at: https://${{secrets.DASH_ENTERPRISE_URL}}/${{secrets.APP_NAME}}-staging
+            Production app name: `${{secrets.APP_NAME}}`
+            Current branch name: `${{github.head_ref}}`
+            Commit: ${{github.sha}}
+      - name: Update comment
+        if: steps.fc.outputs.comment-id != ''
+        uses: peter-evans/create-or-update-comment@v1
+        with:
+          comment-id: ${{ steps.fc.outputs.comment-id }}
+          edit-mode: replace
+          body: |
+            Staging application has been deployed and is available at: https://${{secrets.DASH_ENTERPRISE_URL}}/${{secrets.APP_NAME}}-staging
+            Production app name: `${{secrets.APP_NAME}}`
+            Current branch name: `${{github.head_ref}}`
+            Commit: ${{github.sha}}

Procfile

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+web: gunicorn app:server --workers 4 --preload