Add registries/h2/Dockerfile

registries/h2/Dockerfile

@@ -0,0 +1,34 @@
+# Use a lightweight JRE base image
+FROM amazoncorretto:21-alpine
+
+# Define the H2 database version
+ARG H2_VERSION=2.3.232
+
+# Set up environment variables for the data directory
+ENV H2_DATA=/opt/h2-data
+
+# Create the necessary directories and set the working directory
+RUN mkdir -p ${H2_DATA}
+WORKDIR /opt/h2
+
+# Download the H2 database JAR file
+RUN wget -q "https://repo1.maven.org/maven2/com/h2database/h2/${H2_VERSION}/h2-${H2_VERSION}.jar" -O h2.jar
+
+# Expose the standard ports:
+# 8082: Web Console
+# 9092: TCP Server
+EXPOSE 8082 9092
+
+# Define a volume to persist the database files, preventing data loss on container restart
+VOLUME ${H2_DATA}
+
+# Set the command to initialise and start the H2 server
+# -webAllowOthers authorises external connections to the web console
+# -tcpAllowOthers authorises external TCP connections
+# -baseDir specifies the centre of the data storage
+# -ifNotExists allows creating a new database automatically
+CMD ["java", "-cp", "h2.jar", "org.h2.tools.Server", \
+     "-web", "-webAllowOthers", "-webPort", "8082", \
+     "-tcp", "-tcpAllowOthers", "-tcpPort", "9092", \
+     "-baseDir", "/opt/h2-data", \
+     "-ifNotExists"]