fix: align devcontainer Java CI user

Author: t-col

.devcontainer/Dockerfile

@@ -1,6 +1,8 @@
 ARG JAVA_VERSION=8
 FROM eclipse-temurin:${JAVA_VERSION}-jdk-jammy
 
-RUN apt-get update \
+RUN groupadd --gid 1000 vscode \
+    && useradd --uid 1000 --gid 1000 --create-home --shell /bin/bash vscode \
+    && apt-get update \
     && apt-get install -y --no-install-recommends curl git openssh-client \
     && rm -rf /var/lib/apt/lists/*