Simplify unity-actions workflow (#1)

* Simplify unity-actions workflow

* Remove WebGL from build as it's currently failing

* Trigger builds on main branch push

This is tricky. I wish we could trigger on all branches push, but it seems like internal PRs are run twice when using this:

```yaml

on:
  pull_request: {}
  push: {}
```

So specifying a branch is a bit better somehow. Related discussions:
* https://github.community/t/how-to-run-a-workflow-only-once-even-when-triggered-mutliple-times/16436
* https://github.community/t/how-to-trigger-an-action-on-push-or-pull-request-but-not-both/16662

.github/workflows/main.yml

@@ -1,4 +1,4 @@
-name: Actions 😎
+name: Unity Actions
 
 on:
   pull_request: {}
@@ -6,18 +6,76 @@ on:
 
 env:
   UNITY_LICENSE: ${{ secrets.UNITY_LICENSE }}
+  UNITY_VERSION: 2020.1.7f1
+  PROJECT_PATH: .
 
 jobs:
-  buildAndTestForSomePlatforms:
+  checklicense:
+    name: check if UNITY_LICENSE is set in github secrets
+    runs-on: ubuntu-latest
+    outputs:
+      is_unity_license_set: ${{ steps.checklicense_job.outputs.is_unity_license_set }}
+    steps:
+      - name: Check whether unity activation requests should be done
+        id: checklicense_job
+        run: |
+            echo "Skip activation job: ${{ env.UNITY_LICENSE != '' }}"
+            echo "::set-output name=is_unity_license_set::${{ env.UNITY_LICENSE != '' }}"
+  activation:
+    needs: [checklicense]
+    if: needs.checklicense.outputs.is_unity_license_set == 'false'
+    name: Request activation file 🔑
+    runs-on: ubuntu-latest
+    steps:
+      # Request manual activation file
+      - name: Request manual activation file
+        id: getManualLicenseFile
+        uses: webbertakken/unity-request-manual-activation-file@master
+        with:
+          unityVersion: ${{ env.UNITY_VERSION }}
+      # Upload artifact (Unity_v20XX.X.XXXX.alf)
+      - name: Expose as artifact
+        uses: actions/upload-artifact@v1
+        with:
+          name: ${{ steps.getManualLicenseFile.outputs.filePath }}
+          path: ${{ steps.getManualLicenseFile.outputs.filePath }}
+
+  test:
+    needs: [checklicense]
+    if: needs.checklicense.outputs.is_unity_license_set == 'true'
+    name: Test all modes ✨
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          lfs: true
+      - uses: actions/[email protected]
+        with:
+          path: Library
+          key: Library-test-project-${{ matrix.targetPlatform }}
+          restore-keys: |
+            Library-test-project-
+            Library-
+      - uses: webbertakken/[email protected]
+        id: testRunner
+        with:
+          projectPath: ${{ env.PROJECT_PATH }}
+          unityVersion: ${{ env.UNITY_VERSION }}
+          testMode: all
+          customParameters: "-nographics"
+      - uses: actions/upload-artifact@v1
+        with:
+          name: Test results (all modes)
+          path: ${{ steps.testRunner.outputs.artifactsPath }}
+
+  build:
+    needs: [checklicense]
+    if: needs.checklicense.outputs.is_unity_license_set == 'true'
     name: Build for ${{ matrix.targetPlatform }} on version ${{ matrix.unityVersion }}
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
-        projectPath:
-          - .
-        unityVersion:
-          - 2020.1.7f1
         targetPlatform:
           - StandaloneOSX
           - StandaloneWindows64
@@ -33,21 +91,12 @@ jobs:
           restore-keys: |
             Library-${{ matrix.projectPath }}-
             Library-
-#      - uses: webbertakken/unity-test-runner@master
-#        id: testRunner
-#        with:
-#          projectPath: ${{ matrix.projectPath }}
-#          unityVersion: ${{ matrix.unityVersion }}
-#      - uses: actions/upload-artifact@v1
-#        with:
-#          name: Test results (all modes)
-#          path: ${{ steps.testRunner.outputs.artifactsPath }}
-      - uses: webbertakken/unity-builder@master
+      - uses: webbertakken/unity-[email protected]
         with:
-          projectPath: ${{ matrix.projectPath }}
-          unityVersion: ${{ matrix.unityVersion }}
+          projectPath: ${{ env.PROJECT_PATH }}
+          unityVersion: ${{ env.UNITY_VERSION }}
           targetPlatform: ${{ matrix.targetPlatform }}
-          customParameters: '-nographics'
+          customParameters: "-nographics"
       - uses: actions/upload-artifact@v1
         with:
           name: Build