Enhance branch parsing in integration tests workflow

Updated the script to safely parse the testing SDK branch from the PR body, handling case insensitivity and whitespace.

Author: Astraea Quinn S

.github/workflows/integration-tests.yml

@@ -19,13 +19,50 @@ jobs:
     steps:
     - name: Parse testing SDK branch from PR body
       id: parse
+      shell: bash
       run: |
-        # Look for a line like: TESTING_SDK_BRANCH: feature/foo
-        REF=$(printf '%s\n' '${{ github.event.pull_request.body }}' | sed -n 's/^TESTING_SDK_BRANCH:[[:space:]]*//p' | head -n1)
-        if [ -z "$REF" ]; then REF="main"; fi
-        echo "testing_ref=$REF" >> "$GITHUB_OUTPUT"
-        echo "Using testing SDK branch: $REF"
-
+        set -euo pipefail
+  
+        # Safely capture the PR body into a variable without breaking on newlines/quoting
+        pr_body=$(cat <<'EOF'
+        ${{ github.event.pull_request.body }}
+        EOF
+        )
+  
+        # Default if not found
+        default_ref="main"
+  
+        # Extract a line that looks like:
+        #   TESTING_SDK_BRANCH: feature/foo
+        #   Testing_Sdk_Branch:   feature/foo
+        #   some text TESTING_SDK_BRANCH: foo
+        #
+        # Rules:
+        # - key is case‑insensitive
+        # - allows leading/trailing whitespace
+        # - everything after the first ":" (minus surrounding spaces) is the value
+        ref=$(printf '%s\n' "$pr_body" \
+          | awk '
+              BEGIN { IGNORECASE = 1 }
+              {
+                # Look for TESTING_SDK_BRANCH: anywhere on the line
+                match($0, /TESTING_SDK_BRANCH[[:space:]]*:[[:space:]]*(.*)$/, m)
+                if (m[1] != "") {
+                  print m[1]
+                  exit 0
+                }
+              }
+            ' \
+          | head -n1 \
+          | tr -d '\r' \
+        )
+  
+        if [ -z "${ref:-}" ]; then
+          ref="$default_ref"
+        fi
+  
+        echo "testing_ref=$ref" >> "$GITHUB_OUTPUT"
+        echo "Using testing SDK branch: $ref"
     - name: Checkout Language SDK (this PR)
       uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8  # v5.0.0
       with: