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]>

.github/workflows/barman-base-image.yml

@@ -0,0 +1,52 @@
+name: Barman Base Image
+on:
+  pull_request:
+  workflow_dispatch:
+  schedule:
+    - cron: "0 0 * * 0"
+
+env:
+  IMAGE_NAME: "gchr.io/cloudnative-pg/plugin-barman-cloud-base"
+
+permissions:
+  contents: read
+  packages: write
+  pull_requests: write
+
+jobs:
+  build:
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Log in to the GitHub Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build Docker Image
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: ./containers/Dockerfile.barmanbase
+          push: true
+          tags: ${{ env.IMAGE_NAME }}:latest
+
+      - name: Run Snyk to check Docker image for vulnerabilities
+        uses: snyk/actions/docker@master
+        continue-on-error: true
+        env:
+          SNYK_TOKEN: ${{ secrets.SNYK_TOKEN }}
+        with:
+          image: "${{ env.IMAGE_NAME }}:latest"
+          args: --severity-threshold=high --file=./containers/Dockerfile.barmanbase
+      -
+        name: Upload result to GitHub Code Scanning
+        uses: github/codeql-action/upload-sarif@v3
+        with:
+          sarif_file: snyk.sarif

containers/Dockerfile.barmanbase

@@ -0,0 +1,6 @@
+FROM python:3.12-slim AS pythonbuilder
+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 barman[azure,cloud,google,snappy]==3.11.1 setuptools

containers/Dockerfile.sidecar

@@ -34,7 +34,7 @@ RUN --mount=type=cache,target=/go/pkg/mod --mount=type=cache,target=/root/.cache
 # 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 AS pythonbuilder
+FROM gchr.io/cloudnative-pg/plugin-barman-cloud-base:latest AS pythonbuilder
 RUN apt-get update && \
     apt-get install -y postgresql-common build-essential && \
     /usr/share/postgresql-common/pgdg/apt.postgresql.org.sh -y && \