[RelEng] Add reusable verifyFreezePeriode workflow

.github/workflows/callFreezePeriodCheck.yml

@@ -0,0 +1,12 @@
+# This workflow calls the Code-Freeze-Period check
+
+name: Check for Code Freeze Period
+
+on:
+  pull_request:
+    branches: 
+     - 'master'
+
+jobs:
+  check-freeze-period:
+    uses: ./.github/workflows/verifyFreezePeriod.yml

.github/workflows/verifyFreezePeriod.yml

@@ -0,0 +1,23 @@
+# This workflow will check if the project is currently in a Code-Freeze-Period
+
+name: Verify Code Freeze Period
+
+on:
+  workflow_call
+
+jobs:
+  verify-freeze-period:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checking whether Eclipse project is currently in stabilitzation/code-freeze period ...
+        run: |
+          today=$(TZ=UTC date "+%Y%m%d")
+          tomorrow=$(TZ=UTC date -d "+1 days" "+%Y%m%d")
+          calID="cHJmazI2ZmRtcHJ1MW1wdGxiMDZwMGpoNHNAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ"
+          curl "https://calendar.google.com/calendar/u/0/htmlembed?src=${calID}&mode=AGENDA&ctz=UTC&dates=${today}/${tomorrow}" | grep -i -q -e "stabilization"
+          if [[ $? == 0 ]]; then
+            echo "::error::Today is a freeze day"
+            exit 1 #Exiting with non-0 makes this workflow fail
+          fi
+          echo "No code freeze today"
+        shell: bash {0} # do not fail-fast

Jenkinsfile

@@ -32,14 +32,5 @@ pipeline {
 				}
 			}
 		}
-		stage('Check freeze period') {
-			steps {
-				sh "wget https://download.eclipse.org/eclipse/relengScripts/scripts/verifyFreezePeriod.sh"
-				sh "chmod +x verifyFreezePeriod.sh"
-				withCredentials([string(credentialsId: 'google-api-key', variable: 'GOOGLE_API_KEY')]) {
-					sh './verifyFreezePeriod.sh'
-				}
-			}
-		}
 	}
 }