camel-itest-spring-boot tests are really slow (2h), avoid executing on PRs. The tests will be still executed on Jenkins

Author: Croway

.github/workflows/pr-build-main.yml

@@ -57,3 +57,5 @@ jobs:
         skip-mvnd-install: 'false'
         github-repo: apache/camel-spring-boot
         artifact-upload-suffix: java-${{ matrix.java }}
+      env:
+        MVND_OPTS: -pl !tests/camel-itest-spring-boot