Add cloudbuild script to allow for regular image re-builds

Dockerfile

@@ -15,30 +15,35 @@
 FROM golang
 SHELL ["/bin/bash", "-c"]
 
-#RUN git clone https://github.com/mbj4668/pyang.git /workspace/results/pyang@head/pyang
 RUN git clone https://github.com/openconfig/oc-pyang /workspace/oc-pyang-repo
 RUN git clone https://github.com/robshakir/pyangbind /workspace/pyangbind-repo
 
 RUN apt-get update
 RUN apt install -y python3-pip
-RUN pip3 install virtualenv
+RUN apt install -y virtualenv
+# Not using virtualenv since some validators (e.g. pyang) already uses
+# virtualenv, and we can't nest virtualenvs.
+# TODO(wenovus): Move these into a requirement file for each validator so
+# installing python packages here is not necessary.
 #RUN virtualenv /workspace/pyangvenv
 
 # Install packages for latest pyang venv.
-RUN pip3 install wheel && \
-        pip3 install pyaml && \
-        pip3 install enum34 && \
-        pip3 install jinja2 && \
-        pip3 install setuptools && \
-        pip3 install --no-cache-dir -r /workspace/oc-pyang-repo/requirements.txt && \
-        pip3 install --no-cache-dir -r /workspace/pyangbind-repo/requirements.txt
-#        pip3 install pyangbind
+RUN apt install python3-wheel && \
+        pip3 install pyaml enum34 --break-system-packages && \
+        apt install -y python3-jinja2 && \
+        apt install -y python3-setuptools && \
+        pip3 install --no-cache-dir --break-system-packages -r /workspace/oc-pyang-repo/requirements.txt && \
+        pip3 install --no-cache-dir --break-system-packages -r /workspace/pyangbind-repo/requirements.txt
 
-RUN apt install -y npm && npm install -g npm && npm install -g badge-maker
+RUN apt install -y npm
+#RUN npm install -g npm
+RUN npm install -g badge-maker
 
 # Downloading gcloud package
 RUN curl https://dl.google.com/dl/cloudsdk/release/google-cloud-sdk.tar.gz > /tmp/google-cloud-sdk.tar.gz
 
+ENV CLOUDSDK_PYTHON /usr/bin/python3
+
 # Installing the package
 RUN mkdir -p /usr/local/gcloud \
   && tar -C /usr/local/gcloud -xvf /tmp/google-cloud-sdk.tar.gz \

cloudbuild/cloudbuild.yaml

@@ -0,0 +1,7 @@
+steps:
+  - name: 'gcr.io/cloud-builders/docker'
+    args: [ 'build', '-t', 'us-west1-docker.pkg.dev/$PROJECT_ID/models-ci/models-ci-image', '-f', 'Dockerfile', '.' ]
+  - name: 'gcr.io/cloud-builders/docker'
+    args: ['push', 'us-west1-docker.pkg.dev/$PROJECT_ID/models-ci/models-ci-image']
+images:
+  - us-west1-docker.pkg.dev/$PROJECT_ID/models-ci/models-ci-image