Add a cloud builder for Pants build system

pants/Dockerfile

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+ARG PY_VERSION=3.11
+FROM python:${PY_VERSION}-bookworm
+
+RUN export DEBIAN_FRONTEND=noninteractive \
+    && apt-get update \
+    && apt-get -y upgrade \
+    && apt-get -y install --no-install-recommends  \
+    curl ca-certificates
+
+ENV PATH="/root/.local/bin:$PATH"
+RUN curl --proto '=https' --tlsv1.2 -fsSL https://static.pantsbuild.org/setup/get-pants.sh | bash
+
+ENTRYPOINT [ "pants" ]

pants/README.md

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+# Pants
+
+The [pants](https://pantsbuild.org) build system is an open-source mutilingual build tool.
+
+
+## Building this builder
+
+gcloud builds submit . --config=cloudbuild.yaml --substitutions=_PY_VERSION="3.11"
+
+## Using Pants
+
+Assuming you built and pushed the pants builder for python 3.11, an example usage might
+look like:
+
+```
+steps:
+  - name: gcr.io/$PROJECT_ID/pants:3.11
+    args:
+      - package
+      - path/to/my:package
+```

pants/cloudbuild.yaml

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+# yaml-language-server: $schema=https://json.schemastore.org/cloudbuild
+steps:
+  - name: gcr.io/cloud-builders/docker
+    args: ['build', '.', '--tag=gcr.io/$PROJECT_ID/pants:${_PY_VERSION}', '--build-arg', 'PY_VERSION=${_PY_VERSION}']
+  - name: gcr.io/$PROJECT_ID/pants:${_PY_VERSION}
+    env:
+      - PANTS_BOOTSTRAP_VERSION=report
+substitutions:
+  _PY_VERSION: "3.11"
+images: ['gcr.io/$PROJECT_ID/pants:${_PY_VERSION}']
+tags: ['cloud-builders-community']