Add custom workflow

Author: muzahidul-opti

.github/workflows/flutter.yml

@@ -5,6 +5,16 @@ on:
     branches: [ "master" ]
   pull_request:
     branches: [ "master" ]
+  workflow_dispatch:
+    inputs:
+      sdk_branch:
+        description: "Specify the SDK branch"
+        required: false
+        default: "master"
+      testapp_branch:
+        description: "Specify the test app branch"
+        required: false
+        default: "master"
 
 jobs:
   unit_test_coverage:
@@ -36,19 +46,34 @@ jobs:
         repository: 'optimizely/travisci-tools'
         path: 'home/runner/travisci-tools'
         ref: 'master'
-    - name: set SDK Branch if PR
-      env:
-        HEAD_REF: ${{ github.head_ref }}
-      if: ${{ github.event_name == 'pull_request' }}
-      run: |
-        echo "SDK_BRANCH=$HEAD_REF" >> $GITHUB_ENV
-    - name: set SDK Branch if not pull request
-      env:
-        REF_NAME: ${{ github.ref_name }}
-      if: ${{ github.event_name != 'pull_request' }}
+    # Set SDK Branch based on input or PR/Push
+    - name: Set SDK Branch and Test App Branch
       run: |
-        echo "SDK_BRANCH=$REF_NAME" >> $GITHUB_ENV
-        echo "TRAVIS_BRANCH=$REF_NAME" >> $GITHUB_ENV
+        # If manually triggered
+        if [[ "${{ github.event_name }}" == "workflow_dispatch" ]]; then
+          echo "SDK_BRANCH=${{ github.event.inputs.sdk_branch || 'master' }}" >> $GITHUB_ENV
+          echo "TESTAPP_BRANCH=${{ github.event.inputs.testapp_branch || 'master' }}" >> $GITHUB_ENV
+        # If triggered by PR
+        elif [[ "${{ github.event_name }}" == "pull_request" ]]; then
+          echo "SDK_BRANCH=${{ github.head_ref }}" >> $GITHUB_ENV
+        # If triggered by push
+        else
+          echo "SDK_BRANCH=${{ github.ref_name }}" >> $GITHUB_ENV
+          echo "TRAVIS_BRANCH=${{ github.ref_name }}" >> $GITHUB_ENV
+        fi
+    # - name: set SDK Branch if PR
+    #   env:
+    #     HEAD_REF: ${{ github.head_ref }}
+    #   if: ${{ github.event_name == 'pull_request' }}
+    #   run: |
+    #     echo "SDK_BRANCH=$HEAD_REF" >> $GITHUB_ENV
+    # - name: set SDK Branch if not pull request
+    #   env:
+    #     REF_NAME: ${{ github.ref_name }}
+    #   if: ${{ github.event_name != 'pull_request' }}
+    #   run: |
+    #     echo "SDK_BRANCH=$REF_NAME" >> $GITHUB_ENV
+    #     echo "TRAVIS_BRANCH=$REF_NAME" >> $GITHUB_ENV
     - name: Trigger build
       env:
         SDK: android