Add xcode selection to other workflows.

Author: jonsimantov

.github/workflows/desktop.yml

@@ -6,6 +6,9 @@ on:
 
 env:
   CCACHE_DIR: ${{ github.workspace }}/ccache_dir
+  # Xcode version 11.7 is the version we build the SDK with.
+  # Our MacOS runners will use the version in /Applications/Xcode_${xcodeVersion}.app
+  xcodeVersion: "11.7"
 
 jobs:
   build:
@@ -40,6 +43,10 @@ jobs:
           msvc_runtime: "dynamic"
 
     steps:
+      - name: setup Xcode version (macos)
+        if: runner.os == 'macOS'
+        run: sudo xcode-select -s /Applications/Xcode_${{ env.xcodeVersion }}.app/Contents/Developer
+
       - uses: actions/checkout@v2
         with:
           submodules: true

.github/workflows/ios.yml

@@ -4,6 +4,11 @@ on:
   pull_request:
     types: [opened, reopened, synchronize]
 
+env:
+  # Xcode version 11.7 is the version we build the SDK with.
+  # Our MacOS runners will use the version in /Applications/Xcode_${xcodeVersion}.app
+  xcodeVersion: "11.7"
+
 jobs:
   build:
     name: ios-macos-latest
@@ -12,6 +17,10 @@ jobs:
       fail-fast: false
 
     steps:
+      - name: setup Xcode version (macos)
+        if: runner.os == 'macOS'
+        run: sudo xcode-select -s /Applications/Xcode_${{ env.xcodeVersion }}.app/Contents/Developer
+
       - uses: actions/checkout@v2
         with:
           submodules: true