basic-server: build a container for simple testing

Motivation:
In some dev environments running a container is the preferred way, so,
let provide one.

Modification:
Introduce multi-stage container for small image.

Result:

```bash
podman run -p 2049:2049 --name nfs-server docker.io/dcache/nfs4j-server:latest
```

Acked-by: Lea Morschel
Target: master

basic-server/pom.xml

@@ -45,6 +45,35 @@
                     </execution>
                 </executions>
             </plugin>
+
+            <plugin>
+                <groupId>io.fabric8</groupId>
+                <artifactId>docker-maven-plugin</artifactId>
+                <version>0.45.1</version>
+                <configuration>
+                    <images>
+                        <image>
+                            <name>%g/nfs4j-server:%l</name>
+                            <build>
+                                <dockerFile>${project.basedir}/src/main/container/Dockerfile</dockerFile>
+                                <assembly>
+                                    <descriptorRef>artifact-with-dependencies</descriptorRef>
+                                </assembly>
+                            </build>
+                        </image>
+                    </images>
+                </configuration>
+                <executions>
+                    <execution>
+                        <id>build</id>
+                        <phase>install</phase>
+                        <goals>
+                            <goal>build</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+
         </plugins>
     </build>
 

basic-server/src/main/container/Dockerfile

@@ -0,0 +1,29 @@
+FROM almalinux:9-minimal as builder
+
+# Add JRE
+RUN microdnf -y install java-17-openjdk-devel java-17-openjdk-jmods binutils
+RUN jlink -v --compress=2 --strip-debug --no-header-files --no-man-pages --add-modules java.base,java.compiler,java.instrument,java.logging,java.management,java.naming,java.security.jgss,java.transaction.xa,java.xml,jdk.jfr,jdk.security.auth,jdk.unsupported --output /jlink-runtime
+
+
+FROM almalinux:9-minimal
+COPY --from=builder /jlink-runtime /jlink-runtime
+
+# add external files into container at the build time
+COPY run.sh /run.sh
+RUN chmod +x /run.sh
+
+# where we store the data
+RUN mkdir -p /usr/share/nfs4j
+
+# Add JARS
+COPY maven /usr/share/nfs4j/jars
+
+
+# Post-install brutal cleanup
+RUN microdnf clean all && rm -rf /var/cache/yum /var/lib/dnf /var/lib/rpm
+
+# expose TCP ports for network services
+EXPOSE 2049
+
+# by default we start server
+CMD ["/run.sh"]

basic-server/src/main/container/run.sh

@@ -0,0 +1,5 @@
+#!/bin/sh
+
+exec /jlink-runtime/bin/java \
+	${JAVA_OPT} ${JMX} ${JAVA_ARGS} \
+	-cp "/usr/share/nfs4j/jars/*" org.dcache.nfs4j.server.Main "$@"