Update container sample to use UBI

[matrober-uk]

Update the OpenShift container sample to use UBI image, due to concerns about supply chain security of images hosted on Docker.io

[matrober-uk]

tested via Ubuntu-based VM:

sudo docker build -t golang-app -f Dockerfile .
[+] Building 0.8s (16/16) FINISHED                                                                                                                                        docker:default
 => [internal] load build definition from Dockerfile                                                                                                                                0.0s
 => => transferring dockerfile: 1.44kB                                                                                                                                              0.0s
 => [internal] load metadata for registry.access.redhat.com/ubi8/go-toolset:1.21                                                                                                    0.5s
 => [internal] load .dockerignore                                                                                                                                                   0.0s
 => => transferring context: 2B                                                                                                                                                     0.0s
 => [internal] load build context                                                                                                                                                   0.0s
 => => transferring context: 149B                                                                                                                                                   0.0s
 => [builder 1/7] FROM registry.access.redhat.com/ubi8/go-toolset:1.21@sha256:4ec05fd5b355106cc0d990021a05b71bbfb9231e4f5bdc0c5316515edf6a1c96                                      0.0s
 => CACHED [stage-1 2/5] RUN mkdir -p /go/src/openshift-app-sample    && mkdir -p /IBM/MQ/data/errors    && mkdir -p /.mqm    && chmod -R 777 /IBM    && chmod -R 777 /.mqm         0.0s
 => CACHED [stage-1 3/5] WORKDIR /go/src/openshift-app-sample                                                                                                                       0.0s
 => CACHED [builder 2/7] RUN mkdir -p /opt/mqm    && chmod a+rx /opt/mqm                                                                                                            0.0s
 => CACHED [builder 3/7] RUN cd /opt/mqm    && curl -LO "https://public.dhe.ibm.com/ibmdl/export/pub/software/websphere/messaging/mqdev/redist/9.4.0.0-IBM-MQC-Redist-LinuxX64.tar  0.0s
 => CACHED [builder 4/7] RUN mkdir -p /go/src/openshift-app-sample                                                                                                                  0.0s
 => CACHED [builder 5/7] WORKDIR /go/src/openshift-app-sample                                                                                                                       0.0s
 => CACHED [builder 6/7] COPY src/ .                                                                                                                                                0.0s
 => CACHED [builder 7/7] RUN go build -o openshift-app-sample                                                                                                                       0.0s
 => CACHED [stage-1 4/5] COPY --chown=0:0 --from=builder /go/src/openshift-app-sample/openshift-app-sample /go/src/openshift-app-sample                                             0.0s
 => CACHED [stage-1 5/5] COPY --chown=0:0 --from=builder /opt/mqm /opt/mqm                                                                                                          0.0s
 => exporting to image                                                                                                                                                              0.0s
 => => exporting layers                                                                                                                                                             0.0s
 => => writing image sha256:c0e209f3e261e2d6fb00bdf01f80908938796cab90d99698e387e642a19cf680                                                                                        0.0s
 => => naming to docker.io/library/golang-app                                                                                                                                       0.0s
matrober@c48893v1:~/workspace/src/github.com/ibm-messaging/mq-golang-jms20/openshift-app-sample$ sudo docker run c0e209f3e261e2d6fb00bdf01f80908938796cab90d99698e387e642a19cf680
2024/12/19 13:28:29 {errorCode=2277, reason=MQRC_CD_ERROR, linkedErr=MQCONNX: MQCC = MQCC_FAILED [2] MQRC = MQRC_CD_ERROR [2277]}
Beginning world!!!