Add slack bot and failure message

.github/workflows/acceptance.yaml

@@ -10,6 +10,12 @@ permissions:
   checks: write
 
 jobs:
+  fail_test:
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Fail Test
+        run: exit 1
+
   apply_network:
     name: Apply Network
     uses: ./.github/workflows/terraform.yaml
@@ -108,3 +114,22 @@ jobs:
       terraform_command: destroy
     secrets:
       AWS_ACCOUNT_ID: ${{ secrets.AWS_ACCOUNT_ID }}
+
+  notify_slack:
+    runs-on: ubuntu-20.04
+    defaults:
+      run:
+        shell: bash
+    steps:
+    - name: Notify Slack
+      if: failure()
+      uses: slackapi/slack-github-action@007b2c3c751a190b6f0f040e47ed024deaa72844 # v1.23.0
+      continue-on-error: true
+      with:
+        channel-id: '#mission-control'
+        payload: |
+          {
+            "text": "TEST_MESSAGE, IGNORE - 'Flightdeck acceptance tests have failed.'",
+          }
+      env:
+        SLACK_BOT_TOKEN: ${{ secrets.SLACK_BOT_TOKEN }}