chore: [DevOps] fail early if spec is unchanged

Author: CharlesDuboisSAP

.github/workflows/spec-update.yaml

@@ -59,11 +59,6 @@ jobs:
           java-version: ${{ env.JAVA_VERSION }}
           cache: 'maven'
 
-      - name: "Install Baseline SDK Version"
-        # this is needed as otherwise "process sources" will fail on e.g. orchestration module, if the core module isn't in the maven cache
-        run: |
-          mvn install -DskipTests
-
       - name: "Checkout or Create Branch"
         id: branch
         # Checkout branch if it exists, otherwise create it
@@ -110,6 +105,11 @@ jobs:
             echo "spec_diff=false" >> "$GITHUB_OUTPUT"
           fi
 
+      - name: "Install Baseline SDK Version"
+        # this is needed as otherwise "process sources" will fail on e.g. orchestration module, if the core module isn't in the maven cache
+        run: |
+          mvn install -DskipTests
+
       - name: "Generate"
         id: generate
         if: steps.spec_diff.outputs.spec_diff == 'true'