feat: add buildProfile parameter (#685)

* feat: add `buildProfile` parameter

add new `buildProfile` action param, which will be passed into
Unity as the `-activeBuildProfile ...` CLI param.

closes https://github.com/game-ci/unity-builder/issues/674

* ci: add tests for Unity 6 and build profiles

dist/platforms/ubuntu/steps/build.sh

@@ -19,6 +19,22 @@ echo "Using build name \"$BUILD_NAME\"."
 
 echo "Using build target \"$BUILD_TARGET\"."
 
+#
+# Display the build profile
+#
+
+if [ -z "$BUILD_PROFILE" ]; then
+  # User has not provided a build profile
+  #
+  echo "Doing a default \"$BUILD_TARGET\" platform build."
+  #
+else
+  # User has provided a path to a build profile `.asset` file
+  #
+  echo "Using build profile \"$BUILD_PROFILE\" relative to \"$UNITY_PROJECT_PATH\"."
+  #
+fi
+
 #
 # Display build path and file
 #
@@ -112,6 +128,7 @@ unity-editor \
   -buildTarget "$BUILD_TARGET" \
   -customBuildTarget "$BUILD_TARGET" \
   -customBuildPath "$CUSTOM_BUILD_PATH" \
+  -customBuildProfile "$BUILD_PROFILE" \
   -executeMethod "$BUILD_METHOD" \
   -buildVersion "$VERSION" \
   -androidVersionCode "$ANDROID_VERSION_CODE" \