chore: add Barman base image

Now we build an image every week with the base packages required for
the sidecar, the idea is to reduce the amount of time of every CI
process requires to run.

Signed-off-by: Jonathan Gonzalez V. <[email protected]>

Author: sxd

containers/Dockerfile.sidecar

@@ -33,17 +33,10 @@ COPY ../internal/ internal/
 RUN --mount=type=cache,target=/go/pkg/mod --mount=type=cache,target=/root/.cache/go-build \
     CGO_ENABLED=0 GOOS=${TARGETOS:-linux} GOARCH=${TARGETARCH} go build -a -o manager cmd/manager/main.go
 
-# Build barman-cloud
+# Use plug-barman-cloud-base to get the dependencies
 # pip will build everything inside /usr/ since this is the case
-# we should build and then copy every file into a destination that will
-# then copy into the distroless container
-FROM python:3.13-slim-bookworm AS pythonbuilder
-COPY containers/sidecar-requirements.txt .
-RUN apt-get update && \
-    apt-get install -y postgresql-common build-essential && \
-    /usr/share/postgresql-common/pgdg/apt.postgresql.org.sh -y && \
-    apt-get install -y libpq-dev && \
-    pip install -r sidecar-requirements.txt
+# Copy every file into a destination that will then copy into the distroless container
+FROM ghcr.io/cloudnative-pg/plugin-barman-cloud-base:latest AS pythonbuilder
 # Prepare a new /usr/ directory with the files we'll need in the final image
 RUN mkdir /new-usr/ && \
     cp -r --parents /usr/local/lib/ /usr/lib/*-linux-gnu/ /usr/local/bin/ \