Address review comments

Containerfile.tools

@@ -0,0 +1,51 @@
+#
+# Copyright (c) 2023 Red Hat, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
+# in compliance with the License. You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software distributed under the License
+# is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+# or implied. See the License for the specific language governing permissions and limitations under
+# the License.
+#
+
+FROM registry.access.redhat.com/ubi9/ubi:9.2 AS builder
+
+# Install packages.
+RUN \
+  dnf install -y \
+  make \
+  && \
+  dnf clean all
+
+# Currently RHEL 9 doesn't provide a Go 1.21 compiler, so we need to install it from the Go
+# downloads site.
+RUN \
+  curl -Lo tarball https://go.dev/dl/go1.21.3.linux-amd64.tar.gz && \
+  echo 1241381b2843fae5a9707eec1f8fb2ef94d827990582c7c7c32f5bdfbfd420c8 tarball | sha256sum -c && \
+  tar -C /usr/local -xf tarball && \
+  rm tarball
+
+WORKDIR /go/src/github.com/openshift-kni/oran-o2ims
+COPY . .
+
+# Update GOPATH and PATH.
+ENV \
+  GOPATH=/go
+ENV \
+  PATH="${PATH}:/usr/local/go/bin:${GOPATH}/bin"
+
+# Install ginkgo & mockgen.
+RUN go install github.com/onsi/ginkgo/v2/ginkgo@$(go list -f '{{.Version}}' -m github.com/onsi/ginkgo/v2) && \
+    go install go.uber.org/mock/[email protected]
+
+# Install golangci-lint.
+RUN \
+  curl -Lo tarball https://github.com/golangci/golangci-lint/releases/download/v1.55.2/golangci-lint-1.55.2-linux-amd64.tar.gz && \
+  echo ca21c961a33be3bc15e4292dc40c98c8dcc5463a7b6768a3afc123761630c09c tarball | sha256sum -c && \
+  tar -C /usr/local/bin --strip-components=1 -xf tarball golangci-lint-1.55.2-linux-amd64/golangci-lint && \
+  rm tarball
+