Additional Dockerfile optimization on PR feedback

.ci/openshift-ci/build-root/Dockerfile

@@ -9,17 +9,18 @@ ENV VERSION=1.19 \
     LOGNAME=deadbeef
 ENV PATH=$PATH:$GOROOT/bin:$GOPATH/bin
 
-# Do all the stuff related with Golang, see https://github.com/openshift/release/blob/master/clusters/app.ci/supplemental-ci-images/ci-tools-build-root.yaml#L338
+# Install additional tooling, see https://github.com/openshift/release/blob/master/clusters/app.ci/supplemental-ci-images/ci-tools-build-root.yaml#L338
 RUN dnf install -y epel-release && \
     rpm -V epel-release && \
-    INSTALL_PKGS="git tar wget which zip httpd-tools" && \
+    INSTALL_PKGS="git java-17-openjdk.x86_64 httpd-tools" && \
     dnf install -y $INSTALL_PKGS && \
     rpm -V $INSTALL_PKGS && \
     dnf clean all && \
     touch /os-build-image && \
     git config --system user.name fabiobrz && \
     git config --system user.email [email protected]
 
+# Install Golang
 RUN \
     set -x &&  \
     curl --fail --retry 3 -L https://golang.org/dl/go$VERSION.linux-amd64.tar.gz | tar -C /usr/local -xzf - && \
@@ -35,17 +36,6 @@ RUN \
 RUN chmod g+xw -R $GOPATH && \
     chmod g+xw -R $(go env GOROOT)
 
-# Downloading and installing Java
-ENV JAVA_PKG=https://download.oracle.com/java/17/latest/jdk-17_linux-x64_bin.tar.gz \
-      JAVA_HOME=/usr/java/jdk-17
-
-RUN set -eux; \
-      JAVA_SHA256=$(curl "$JAVA_PKG".sha256) ; \
-      curl --output /tmp/jdk.tgz "$JAVA_PKG" && \
-      echo "$JAVA_SHA256 */tmp/jdk.tgz" | sha256sum -c; \
-      mkdir -p "$JAVA_HOME"; \
-      tar --extract --file /tmp/jdk.tgz --directory "$JAVA_HOME" --strip-components 1
-
 # Downloading and installing Maven
 ARG MAVEN_VERSION=3.8.8
 ARG BASE_URL=https://apache.osuosl.org/maven/maven-3/${MAVEN_VERSION}/binaries
@@ -69,7 +59,7 @@ ENV OC_PKG=https://mirror.openshift.com/pub/openshift-v4/clients/ocp/latest-4.12
       OC_HOME=/usr/oc/oc-4.1.2
 
 RUN set -eux; \
-      curl -L --output /tmp/oc.tgz "$OC_PKG" -v; \
+      curl -L --output /tmp/oc.tgz "$OC_PKG"; \
       mkdir -p "$OC_HOME"; \
       tar --extract --file /tmp/oc.tgz --directory "$OC_HOME"; \
       ln -s "$OC_HOME"/oc /usr/bin/oc