Prevent CI workflows from running on forks (#90)

diff --git a/.github/workflows/master-pr-build.yml b/.github/workflows/master-pr-build.yml
index dfe1a2a..0b6f88d 100644
--- a/.github/workflows/master-pr-build.yml
+++ b/.github/workflows/master-pr-build.yml
@@ -23,6 +23,7 @@
       - main
 jobs:
   build:
+    if: github.repository == 'apache/camel-spring-boot-examples'
     runs-on: ubuntu-latest
     strategy:
       matrix:
diff --git a/.github/workflows/master-push-build.yml b/.github/workflows/master-push-build.yml
index 8bf39e0..848b4cd 100644
--- a/.github/workflows/master-push-build.yml
+++ b/.github/workflows/master-push-build.yml
@@ -23,6 +23,7 @@
       - main
 jobs:
   build:
+    if: github.repository == 'apache/camel-spring-boot-examples'
     runs-on: ubuntu-latest
     strategy:
       matrix: