feat: add PostgreSQL 17beta1 images (#107)

Adding documentation on the project's structure and on how to add a new Postgres Beta version.

Signed-off-by: Gabriele Bartolini <gabriele.bartolini@enterprisedb.com>
Signed-off-by: Niccolò Fei <niccolo.fei@enterprisedb.com>
Co-authored-by: Niccolò Fei <niccolo.fei@enterprisedb.com>

Debian/17/bookworm/Dockerfile

@@ -0,0 +1,55 @@
+# vim:set ft=dockerfile:
+#
+# Copyright The CloudNativePG Contributors
+#
+# 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
+# 
+#    http://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 postgres:17beta1-bookworm
+
+# Do not split the description, otherwise we will see a blank space in the labels
+LABEL name="PostgreSQL Container Images" \
+      vendor="The CloudNativePG Contributors" \
+      version="${PG_VERSION}" \
+      release="1" \
+      summary="PostgreSQL Container images." \
+      description="This Docker image contains PostgreSQL and Barman Cloud based on Postgres 17beta1-bookworm."
+
+LABEL org.opencontainers.image.description="This Docker image contains PostgreSQL and Barman Cloud based on Postgres 17beta1-bookworm."
+
+COPY requirements.txt /
+
+# Install additional extensions
+RUN set -xe; \
+	apt-get update; \
+	apt-get install -y --no-install-recommends \
+		"postgresql-${PG_MAJOR}-pgvector" \
+	; \
+	rm -fr /tmp/* ; \
+	rm -rf /var/lib/apt/lists/*;
+
+# Install barman-cloud
+RUN set -xe; \
+	apt-get update; \
+	apt-get install -y --no-install-recommends \
+		python3-pip \
+		python3-psycopg2 \
+		python3-setuptools \
+	; \
+	pip3 install --break-system-packages --upgrade pip; \
+# TODO: Remove --no-deps once https://github.com/pypa/pip/issues/9644 is solved
+	pip3 install --break-system-packages --no-deps -r requirements.txt; \
+	rm -rf /var/lib/apt/lists/*;
+
+# Change the uid of postgres to 26
+RUN usermod -u 26 postgres
+USER 26