Adjust Dockerfile to be more friendly with openshift-ci

In openshift-ci, only static values can be passed when building a
Dockerfile. However, the `imageVersion`, `buildId` and `commitSha` are
required to be generated when doing the build (are dynamic); e.g:

```
GIT_COMMIT=$(git rev-parse HEAD)
BUILD_ID=$(date '+%Y%m%d')-$(git rev-parse HEAD | cut -c -5)
IMAGE_TAG_VERSION=0.11.0-alpha
IMAGE_TAG=${IMAGE_TAG_VERSION}-$(git branch --show-current)_${BUILD_ID}

podman build \
    --build-arg imageVersion=${IMAGE_TAG} \
    --build-arg buildId=${BUILD_ID} \
    --build-arg commitSha=${GIT_COMMIT} .
```

The most important argument is `buildId` to let ModelMesh identify the
build date of itself.

This changes the Dockerfile to resolve the `buildId` in the builder
stage. The `imageVersion` and `commitSha` arguments are lost, under the
rationale that these are not essential for ModelMesh to work correctly.

Signed-off-by: Edgar Hernández <[email protected]>

Author: israel-hdez

.dockerignore

@@ -5,7 +5,6 @@
 .cache
 .dockerignore
 .env
-.git
 .github
 .gitignore
 .idea

Dockerfile

@@ -44,6 +44,7 @@ RUN --mount=type=cache,target=/root/.cache/microdnf:rw \
        tar \
        gzip \
        maven \
+       git \
     && true
 
 # Install etcd -- used for CI tests
@@ -74,6 +75,11 @@ ENV MAVEN_OPTS="-Dfile.encoding=UTF8"
 RUN --mount=type=cache,target=/root/.m2 \
     mvn -B package -DskipTests=true --file pom.xml
 
+# Assume that source code comes from a Git repository
+RUN echo "$(date '+%Y%m%d')-$(git rev-parse HEAD | cut -c -5)" > target/dockerhome/build-version && \
+  echo "$(git rev-parse HEAD)" > target/dockerhome/release && \
+  echo "$(git branch --show-current|sed 's/^release-//g')-$(git branch --show-current)_$(date '+%Y%m%d')-$(git rev-parse HEAD | cut -c -5)" > target/dockerhome/version
+
 
 ###############################################################################
 FROM registry.access.redhat.com/ubi8/ubi-minimal:8.6 AS runtime
@@ -124,18 +130,19 @@ RUN --mount=type=cache,target=/root/.cache/microdnf:rw \
 
 # wait to create commit-specific LABEL until end of the build to not unnecessarily
 # invalidate the cached image layers
-ARG imageVersion
-ARG buildId
-ARG commitSha
+# ARG imageVersion
+# ARG buildId
+# ARG commitSha
 
-RUN echo "${buildId}" > /opt/kserve/mmesh/build-version
+# Generated at build stage
+# RUN echo "${buildId}" > /opt/kserve/mmesh/build-version
 
 LABEL name="model-mesh" \
       vendor="KServe" \
-      version="${imageVersion}" \
+#      version="${imageVersion}" \
       summary="Core model-mesh sidecar image" \
       description="Model-mesh is a distributed LRU cache for serving runtime models" \
-      release="${commitSha}" \
+#      release="${commitSha}" \
       maintainer="[email protected]"
 
 EXPOSE 8080