Only run beta and release workflows on main repo.

Author: marc0der

.github/workflows/beta.yml

@@ -7,6 +7,7 @@ on:
 jobs:
   pre-release:
     name: "Beta Release"
+    if: github.repository == "sdkman/sdkman-cli"
     environment: production
     runs-on: "ubuntu-latest"
     services:

.github/workflows/release.yml

@@ -6,6 +6,7 @@ on:
 jobs:
   build:
     name: "Stable Release"
+    if: github.repository == "sdkman/sdkman-cli"
     runs-on: ubuntu-latest
     environment: production
     services: