Updated CI workflow for 3.x branch changes

- this branch is now the maintenance branch for 3.x so we don't want to
  build canary packages on it
- also updates the Slack notification if-statements to check if we're on
  the 3.x branch

.github/workflows/test.yml

@@ -3,8 +3,6 @@ on:
   pull_request:
   push:
     branches:
-      - master
-      - '4.0'
       - 3.*
       - 2.x
       - 'renovate/*'
@@ -23,7 +21,7 @@ jobs:
       - run: yarn
       - run: yarn lint
       - uses: daniellockyer/action-slack-build@master
-        if: failure() && github.event_name == 'push' && (github.ref == 'refs/heads/master' || github.ref == 'refs/heads/4.0')
+        if: failure() && github.event_name == 'push' && github.ref == 'refs/heads/3.x'
         with:
           status: ${{ job.status }}
         env:
@@ -108,7 +106,7 @@ jobs:
       - run: grunt test-regression --verbose
 
       - uses: daniellockyer/action-slack-build@master
-        if: failure() && github.event_name == 'push' && (github.ref == 'refs/heads/master' || github.ref == 'refs/heads/4.0')
+        if: failure() && github.event_name == 'push' && github.ref == 'refs/heads/3.x'
         with:
           status: ${{ job.status }}
         env:
@@ -154,70 +152,8 @@ jobs:
           ghost update -f -d $DIR --zip $GITHUB_WORKSPACE/ghost.zip
 
       - uses: daniellockyer/action-slack-build@master
-        if: failure() && github.event_name == 'push' && (github.ref == 'refs/heads/master' || github.ref == 'refs/heads/4.0')
+        if: failure() && github.event_name == 'push' && github.ref == 'refs/heads/3.x'
         with:
           status: ${{ job.status }}
         env:
           SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}
-
-  canary:
-    runs-on: ubuntu-18.04
-    needs: [lint, migrations, test, ghost-cli]
-    if: github.event_name == 'push' && (github.ref == 'refs/heads/master' || github.ref == 'refs/heads/4.0')
-    name: Canary
-    steps:
-      - uses: actions/checkout@v2
-        with:
-          fetch-depth: 0
-          submodules: true
-      - uses: actions/setup-node@v2
-        with:
-          node-version: '12.18.0'
-
-      - name: Set up Git
-        run: |
-          git config --global pull.rebase true
-          git config --global user.name "Ghost CI"
-          git config --global user.email "ghost@example.com"
-
-      - run: yarn
-      - run: grunt master
-
-      - run: git checkout 4.0 && yarn
-        if: github.ref == 'refs/heads/4.0'
-      - run: git checkout 4.0 && yarn
-        if: github.ref == 'refs/heads/4.0'
-        working-directory: core/client
-
-      - run: echo "ghost_hash=$(git rev-parse --short HEAD)" >> $GITHUB_ENV
-      - run: echo "ghost_admin_hash=$(git rev-parse --short HEAD)" >> $GITHUB_ENV
-        working-directory: core/client
-      - run: if [ -n "$(git status --porcelain)" ]; then git add core/client content/themes/casper && git commit -m "Updated Ghost-Admin and Casper"; fi
-
-      - run: npm version premajor --preid="pre.$ghost_hash.$ghost_admin_hash"
-        if: github.ref == 'refs/heads/4.0'
-      - run: npm version premajor --preid="pre.$ghost_hash.$ghost_admin_hash"
-        if: github.ref == 'refs/heads/4.0'
-        working-directory: core/client
-
-      - run: npm version preminor --preid="pre.$ghost_hash.$ghost_admin_hash"
-        if: github.ref == 'refs/heads/master'
-      - run: npm version preminor --preid="pre.$ghost_hash.$ghost_admin_hash"
-        if: github.ref == 'refs/heads/master'
-        working-directory: core/client
-
-      - run: grunt release --skip-update
-
-      - uses: actions/upload-artifact@v2
-        if: github.ref == 'refs/heads/4.0'
-        with:
-          name: ghost-4.0-canary
-          path: .dist/release/*
-          retention-days: 7
-
-      - uses: actions/upload-artifact@v2
-        if: github.ref == 'refs/heads/master'
-        with:
-          name: ghost-canary
-          path: .dist/release/*
-          retention-days: 7