feat(ci): add bob-build-env Dockerfile

this is used to contain all the dependencies required
to run the build tests including bazel/bazelisk.

Change-Id: I4c9c2b1e43209c24e511b732232ac0bce0a2417d
Signed-off-by: Jordan Bonser <jordan.bonser@arm.com>

Author: jordan-bonser

ci/docker/bob-build-env/Dockerfile

@@ -0,0 +1,40 @@
+ARG GO_VERSION=1.18
+FROM golang:${GO_VERSION}-bullseye
+
+ARG BAZELISK_VERSION=1.24.0
+RUN CGO_ENABLED=0 GOOS=linux GOBIN=/usr/local/bin go install github.com/bazelbuild/bazelisk@v${BAZELISK_VERSION}
+
+# Install packages
+# git required for blueprint
+# build-essential needed for io_bazel_rules_go
+RUN apt update \
+ && apt -y --no-install-recommends install \
+      ca-certificates \
+      build-essential \
+      gcc-aarch64-linux-gnu \
+      git \
+      ninja-build \
+      python3 \
+      python3-dev \
+      python3-pip \
+      python-is-python3 \
+      python3-ply \
+      rsync \
+ && rm -rf /var/lib/apt/lists/*
+
+RUN printf '%s\n' 'export PATH=/home/ci/.local/bin:/go/bin:/usr/local/go/bin:$PATH' \
+     > /etc/profile.d/bob-build-env-path.sh
+
+
+ARG USER_ID=1001
+RUN useradd --create-home --shell /bin/bash --uid $USER_ID ci
+USER ci
+WORKDIR /home/ci
+
+ENV PATH=/home/ci/.local/bin:$PATH
+ENV BAZELISK_HOME=/home/ci/.cache/bazelisk
+
+# Pre-download _latest_ bazel version to save time in CI
+RUN bash -lc 'go version' && \
+     USE_BAZEL_VERSION=latest bazelisk --version && \
+     USE_BAZEL_VERSION=8.0.0 bazelisk --version

ci/docker/bob-build-env/README.md

@@ -0,0 +1,20 @@
+# bob-build-env docker image
+
+This docker image contains the required dependencies to run the build tests in ci, including
+the new bazel based build tests.
+
+# Creating the docker image
+
+```
+docker build -t bob-build-env ci/docker/bob-build-env/
+docker tag bob-build-env:latest gpuddk--docker.artifactory.arm.com/gpuddk/bob-build-env:latest
+```
+
+# Pushing to Artifactory
+
+```
+export EMAIL=<your_email>
+export ART_TOKEN=<artifactory_token>
+docker login -u$EMAIL -p$ART_TOKEN gpuddk--docker.artifactory.arm.com
+docker push gpuddk--docker.artifactory.arm.com/gpuddk/bob-build-env:latest
+```