[SDK-131] Add checkout of avatar loader branch (#67)

- This update the pr-template with dependency - avatar loader branch
- Also updates test runner to checkout defined avatar loader branch in PR.

- Test runner action to checkout avatar loader specified branch

Author: rYuuk

.github/pull_request_template.md

@@ -5,6 +5,12 @@
 
 ## [TICKETID](https://ready-player-me.atlassian.net/browse/TICKETID)
 
+<!-- Replace the branch with the dependency, if no dependency is required than set this to develop -->
+## Dependencies
+```Package
+Avatar Loader: branch
+```
+
 ## Description
 
 -   Briefly describe what this change will do

.github/workflows/pr-test-runner.yml

@@ -27,13 +27,47 @@ jobs:
           fetch-depth: 0
           ref: develop
           token: ${{ secrets.DEV_SDK_TOKEN }}
+
+      - name: Get PR dependencies
+        id: pr-dependencies
+        run: |
+          PR_DEPENDENCY=$(awk -v start="\`\`\`Package" -v end="\`\`\`" '{
+            if ($0 ~ start) {p=1; next}
+            if (p && !($0 ~ end)) {print}
+            if ($0 ~ end) {p=0}
+          }' <<\EOF
+          ${{ github.event.pull_request.body }}
+          EOF
+          )
+          echo "dependency=$PR_DEPENDENCY" >> "$GITHUB_OUTPUT"
       - name: Checkout submodule branch
         run: |
-          cd ${{ secrets.CORE_PATH }}
+          cd Assets/Ready\ Player\ Me/Core
           git fetch -a
           git checkout ${{ github.event.pull_request.head.ref }}
           git pull origin ${{ github.event.pull_request.head.ref }}
-    
+          
+          dependency="${{ steps.pr-dependencies.outputs.dependency }}"
+          if [ -z "$dependency" ]; then
+            echo "No dependency found in PR description"
+            exit 0
+          fi
+          echo "Dependencies found - ${dependency}"
+          
+          AVATAR_LOADER_BRANCH="${dependency#*Avatar Loader: }"
+          AVATAR_LOADER_BRANCH=$(echo "$AVATAR_LOADER_BRANCH" | tr -d '\r')
+          
+          cd ../Avatar\ Loader
+          git fetch -a
+          git checkout "$AVATAR_LOADER_BRANCH"
+          
+          if [ $? -ne 0 ]; then
+            echo "Avatar loader checkout failed, no branch found with name $AVATAR_LOADER_BRANCH"
+            exit 0
+          fi
+
+          git pull origin "$AVATAR_LOADER_BRANCH"
+
       - name: Cache Project
         uses: actions/cache@v3
         with: