ci: don't build project in integration test workflow during release

Regression introduced in 4571be3; we skip all other steps during the
integration test workflow (git checkout, etc.), so the build step will
always fail.

Author: ndhoule

.github/workflows/integration-tests.yml

@@ -76,6 +76,7 @@ jobs:
 
       - name: Build project
         run: npm run build
+        if: '${{!steps.release-check.outputs.IS_RELEASE}}'
 
       - name: Prepare tests
         run: npm run test:init
@@ -186,6 +187,7 @@ jobs:
 
       - name: Build project
         run: npm run build
+        if: '${{!steps.release-check.outputs.IS_RELEASE}}'
 
       - name: Prepare tests
         run: npm run test:init