Introduce build stage and "when: manual"

.gitlab-ci.yml

+stages:
+  - build
+  - deploy
+
 variables:
   EXPORT_DIR: "/var/www/html/pages"
 
+build-p2:
+  image: maven:3.6.3-adoptopenjdk-15
+  stage: build
+  script:
+    - echo "Maven Version"
+    - mvn --version
+
 pages-master:
   stage: deploy
   script:
@@ -11,6 +22,6 @@ pages-master:
     paths:
       - public
     expire_in: 1 day
-
+  when: manual
   only:
     - master

public/index.html

@@ -4,6 +4,6 @@
 
 <h1>Eclipse P2 Repository for Indriya</h1>
 
-<p>This URL is an Eclipse P2 software repository for the Indriya reference implementation of units of measurement (JSR-385). You must use it in Eclipse (<a href="https://help.eclipse.org/2020-09/index.jsp?topic=/org.eclipse.platform.doc.user/tasks/tasks-127.htm">see how</a>) or add it to a target platform when developing Eclipse Plugins.<p>
+<p>This URL is an Eclipse P2 software repository for the Indriya Units of Measurement reference implementation of(JSR-385). You must use it in Eclipse (<a href="https://help.eclipse.org/2020-09/index.jsp?topic=/org.eclipse.platform.doc.user/tasks/tasks-127.htm">see how</a>) or add it to a target platform when developing Eclipse Plugins.<p>
 </body>
 </html>