Revert "DEV: Add smoke test to github actions (#8580)"

This is proving unreliable, so removing for now

This reverts commit 38b4e3b5a7.

.github/workflows/smoke.yml

@@ -1,63 +0,0 @@
-name: SMOKE TEST
-   
-on:
-  push:
-    branches:
-      - master
-  pull_request:
-    branches-ignore:
-      - 'tests-passed'
-    
-jobs:
-  smoke_test:
-    name: "CORE"
-    runs-on: ubuntu-latest
-    timeout-minutes: 60
-
-    steps:
-      - uses: actions/checkout@master
-        with:
-          fetch-depth: 1
-
-      - name: Install unbuffer
-        run: sudo apt-get install -yqq expect
-
-      - name: Boot dev image
-        run: unbuffer d/boot_dev
-
-      - name: Create script
-        run: | 
-          mkdir tmp
-          touch tmp/script.rb
-          echo "u = User.new(username:'smoke_user', password:'P4ssw0rd', email:'smoke@example.com', admin:true)" >> tmp/script.rb
-          echo "u.save!(validate: false)" >> tmp/script.rb
-          echo "u.activate" >> tmp/script.rb
-          echo "SiteSetting.wizard_enabled = false" >> tmp/script.rb
-
-      - name: tmp
-        run: sudo chown -R 1000:1000 .
-
-      - name: Bundle
-        run: unbuffer d/bundle install
-
-      - name: Migrate
-        run: unbuffer d/rake db:migrate
-
-      - name: Run script
-        run: unbuffer d/rails runner tmp/script.rb
-
-      - name: Start Server
-        run: unbuffer d/rails s &
-
-      - name: Warm Up Server
-        run: curl -I -A "Chrome" --retry 10 --retry-delay 1 --max-time 60 http://localhost:3000
-
-      - name: Run smoke test
-        run: unbuffer d/rake smoke:test
-
-      - uses: actions/upload-artifact@v1
-        if: failure()
-        with:
-          name: smoke-test-screenshots
-          path: tmp/smoke-test-screenshots
-