Exclude UI playground stages from main branch pipeline

Prevent UI playground components (install, build, image, push) from being
built and deployed when running on the main branch. These stages now only
run on non-main branches when relevant files are changed.

Author: claude

Jenkinsfile

@@ -424,11 +424,14 @@ BRANCH_NAME=${env.BRANCH_NAME}"""
 
         stage('Install UI Playground Dependencies') {
             when {
-                anyOf {
-                    changeset "elohim-library/**"
-                    changeset "elohim-ui-playground/**"
-                    changeset "images/Dockerfile.ui-playground"
-                    changeset "images/nginx-ui-playground.conf"
+                allOf {
+                    not { branch 'main' }
+                    anyOf {
+                        changeset "elohim-library/**"
+                        changeset "elohim-ui-playground/**"
+                        changeset "images/Dockerfile.ui-playground"
+                        changeset "images/nginx-ui-playground.conf"
+                    }
                 }
             }
             steps {
@@ -445,11 +448,14 @@ BRANCH_NAME=${env.BRANCH_NAME}"""
 
         stage('Build UI Playground') {
             when {
-                anyOf {
-                    changeset "elohim-library/**"
-                    changeset "elohim-ui-playground/**"
-                    changeset "images/Dockerfile.ui-playground"
-                    changeset "images/nginx-ui-playground.conf"
+                allOf {
+                    not { branch 'main' }
+                    anyOf {
+                        changeset "elohim-library/**"
+                        changeset "elohim-ui-playground/**"
+                        changeset "images/Dockerfile.ui-playground"
+                        changeset "images/nginx-ui-playground.conf"
+                    }
                 }
             }
             steps {
@@ -470,11 +476,14 @@ BRANCH_NAME=${env.BRANCH_NAME}"""
 
         stage('Build UI Playground Image') {
             when {
-                anyOf {
-                    changeset "elohim-library/**"
-                    changeset "elohim-ui-playground/**"
-                    changeset "images/Dockerfile.ui-playground"
-                    changeset "images/nginx-ui-playground.conf"
+                allOf {
+                    not { branch 'main' }
+                    anyOf {
+                        changeset "elohim-library/**"
+                        changeset "elohim-ui-playground/**"
+                        changeset "images/Dockerfile.ui-playground"
+                        changeset "images/nginx-ui-playground.conf"
+                    }
                 }
             }
             steps {
@@ -520,11 +529,14 @@ BRANCH_NAME=${env.BRANCH_NAME}"""
 
         stage('Push UI Playground to Harbor Registry') {
             when {
-                anyOf {
-                    changeset "elohim-library/**"
-                    changeset "elohim-ui-playground/**"
-                    changeset "images/Dockerfile.ui-playground"
-                    changeset "images/nginx-ui-playground.conf"
+                allOf {
+                    not { branch 'main' }
+                    anyOf {
+                        changeset "elohim-library/**"
+                        changeset "elohim-ui-playground/**"
+                        changeset "images/Dockerfile.ui-playground"
+                        changeset "images/nginx-ui-playground.conf"
+                    }
                 }
             }
             steps {