Incorporates the base image building back into the main repo with multi stage building

docker-builders/Dockerfile.psycopg2

@@ -0,0 +1,44 @@
+# This Dockerfile builds the psycopg2 wheel
+# Inputs:
+#		- GIT_TAG - The Git tag to clone and build from
+#		- VERSION - Unused, kept for future possible usage
+
+FROM python:3.9-slim-bullseye
+
+LABEL org.opencontainers.image.description="A intermediate image with psycopg2 wheel built"
+
+ARG DEBIAN_FRONTEND=noninteractive
+
+ARG BUILD_PACKAGES="\
+  build-essential \
+  git \
+  libpq-dev \
+  python3-dev \
+  python3-pip"
+
+WORKDIR /usr/src
+
+# As this is an base image for a multi-stage final image
+# the added size of the install is basically irrelevant
+
+RUN set -eux \
+  && apt-get update --quiet \
+  && apt-get install --yes --quiet --no-install-recommends $BUILD_PACKAGES \
+  && rm -rf /var/lib/apt/lists/* \
+  && python3 -m pip install --upgrade pip wheel
+
+# Layers after this point change according to required version
+# For better caching, seperate the basic installs from
+# the building
+
+ARG GIT_TAG
+ARG VERSION
+
+RUN set -eux \
+	&& echo "Building psycopg2 wheel" \
+  && cd /usr/src \
+  && git clone --quiet --depth 1 --branch ${GIT_TAG} https://github.com/psycopg/psycopg2.git \
+  && cd psycopg2 \
+  && mkdir wheels \
+  && python3 -m pip wheel . --wheel-dir wheels \
+  && ls -ahl wheels/