Configuring dockerfile for rhtap build

Dockerfile

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM golang:1.21.3@sha256:02d7116222536a5cf0fcf631f90b507758b669648e0f20186d2dc94a9b419a9b AS builder
+FROM brew.registry.redhat.io/rh-osbs/openshift-golang-builder:rhel_9_1.21 AS builder
 ENV APP_ROOT=/opt/app-root
 ENV GOPATH=$APP_ROOT
 
@@ -25,11 +25,12 @@ ADD ./cmd/ $APP_ROOT/src/cmd/
 ADD ./pkg/ $APP_ROOT/src/pkg/
 
 ARG SERVER_LDFLAGS
+RUN go mod vendor
 RUN go build -ldflags "${SERVER_LDFLAGS}" ./cmd/timestamp-server
 RUN CGO_ENABLED=0 go build -gcflags "all=-N -l" -ldflags "${SERVER_LDFLAGS}" -o timestamp-server_debug ./cmd/timestamp-server
 
 # Multi-Stage production build
-FROM golang:1.21.3@sha256:02d7116222536a5cf0fcf631f90b507758b669648e0f20186d2dc94a9b419a9b as deploy
+FROM brew.registry.redhat.io/rh-osbs/openshift-golang-builder:rhel_9_1.21 as deploy
 
 # Retrieve the binary from the previous stage
 COPY --from=builder /opt/app-root/src/timestamp-server /usr/local/bin/timestamp-server
@@ -39,7 +40,8 @@ CMD ["timestamp-server", "serve"]
 
 # debug compile options & debugger
 FROM deploy as debug
-RUN go install github.com/go-delve/delve/cmd/[email protected]
+
+RUN go install -mod=mod github.com/go-delve/delve/cmd/[email protected]
 
 # overwrite server and include debugger
 COPY --from=builder /opt/app-root/src/timestamp-server_debug /usr/local/bin/timestamp-server