feat: (poc) create synthtool/synthtool only image

Dockerfile

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+# Copyright 2023 Google LLC
+#
+# 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
+#
+#     https://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 python:3.10.6-buster
+
+COPY . /synthtool/
+
+WORKDIR /synthtool
+# remove postprocessor images
+RUN rm -rdf /synthtool/docker
+
+RUN python3 -m pip install -e .
+RUN python3 -m pip install -r requirements.in
+
+# Allow non-root users to run python
+RUN chmod +rx /root/
+
+WORKDIR /workspace
+
+ENV SYNTHTOOL_TEMPLATES="/synthtool/synthtool/gcp/templates"
+# Put synthtool in the PYTHONPATH so owlbot.py scripts will find it.
+ENV PYTHONPATH="/synthtool"
+
+# Update permissions so non-root users won't see errors.
+RUN find /synthtool -exec chmod a+r {} \;
+RUN find /synthtool -type d -exec chmod a+x {} \;
+
+
+CMD [ "python3" ]