Update gitpod config files (install Java and Java Pack)

Author: stefan-ka

.gitpod.Dockerfile

@@ -2,4 +2,9 @@ FROM gitpod/workspace-full
 
 # Install Graphviz
 RUN sudo apt-get update \
-    && sudo apt-get -y install graphviz
+    && sudo apt-get -y install graphviz
+
+# Install Java
+RUN bash -c ". /home/gitpod/.sdkman/bin/sdkman-init.sh && \
+    sdk install java 17.0.8-tem && \
+    sdk default java 17.0.8-tem"

.gitpod.yml

@@ -4,5 +4,7 @@ image:
   file: .gitpod.Dockerfile
 vscode:
   extensions:
-    - jebbs.plantuml@2.13.12:LcphKtCbPTIScvq6ELiS8Q==
+    - jebbs.plantuml
     - contextmapper.context-mapper-vscode-extension
+    - vscjava.vscode-java-pack
+    - asciidoctor.asciidoctor-vscode