Add Python+git+ssh base image

base-images/python-git-ssh/Dockerfile

@@ -0,0 +1,16 @@
+# Base image: Python 3.12 + git + openssh-client
+# Used by projects that push/pull from Gitea at runtime.
+# Referenced in project Dockerfiles as:
+#   FROM git.thewichersfamily.com/thethreemagi/base-python-git-ssh:latest
+
+FROM python:3.12-slim
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    git \
+    openssh-client \
+    ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN mkdir -p /root/.ssh && chmod 700 /root/.ssh
+
+WORKDIR /app