forcing the werft job to fail if the branch name is too long to support preview-environments

Author: Wulf Thimm

.werft/build.ts

@@ -44,6 +44,19 @@ Tracing.initialize()
 async function run(context: any) {
     const config = jobConfig(werft, context)
 
+    //TODO: This is only a temporary solution and needs to be removed when we migrate to one prev-environment per cluster
+    // Because of a workspace label the branch name that can be used to create a preview environment is limited to 20 chars
+    // echo -n "gitpod.io/registry-facade_ready_ns_staging-" | wc -c
+    if (!config.noPreview) {
+        werft.phase("check-branchname","This checks if the branchname is to long to create a preview-environment successfully.")
+        const maxBranchNameLength = 20;
+        if (config.previewEnvironment.destname.length > maxBranchNameLength) {
+            werft.fail("check-branchname", `The branch name ${config.previewEnvironment.destname} is more than ${maxBranchNameLength} character. Please choose a shorter name!`)
+        }
+        werft.done("check-branchname")
+    }
+
+
     await validateChanges(werft)
     await prepare(werft)
     await buildAndPublish(werft, config)