Allow workflows to be triggered manually without sending notification and force java 11

.github/workflows/nightly.yml

@@ -22,6 +22,10 @@ jobs:
     runs-on: macos-latest
     steps:
       - uses: actions/checkout@v2
+      - uses: actions/setup-java@v2
+        with:
+          distribution: 'adopt'
+          java-version: 11
       - uses: actions/cache@v2
         with:
           path: |
@@ -39,6 +43,10 @@ jobs:
     runs-on: macos-latest
     steps:
       - uses: actions/checkout@v2
+      - uses: actions/setup-java@v2
+        with:
+          distribution: 'adopt'
+          java-version: 11
       - uses: actions/cache@v2
         with:
           path: |
@@ -243,12 +251,13 @@ jobs:
             emulator.log
             failure_screenshots/
 
+# Notify the channel about scheduled runs, do not notify for manually triggered runs
   notify:
     runs-on: ubuntu-latest
     needs:
     - integration-tests
     - ui-tests
-    if: always()
+    if: always() && github.event_name != 'workflow_dispatch'
     steps:
     - uses: michaelkaye/matrix-hookshot-action@v0.2.0
       with: