docker workflow: add pre-build step (#57)

## Description

Add pre-build step in docker workflow to run the `ci-pre-build` task
from Makefile, if the file exists.
This, as example, enables Go builds without vendor folder to download
private dependencies before the docker build.

## Changes Made

Add pre-build step in docker workflow

## Related Issues

N/A

## Checklist

- [x] I have used a PR title that is descriptive enough for a release
note.
- [ ] I have tested these changes locally.
- [ ] I have added appropriate tests or updated existing tests.
- [ ] I have tested these changes on a dedicated VM or a customer VM
[name of the VM]
- [x] I have added appropriate documentation or updated existing
documentation.

---------

Co-authored-by: Federico M. Facca <[email protected]>

.github/workflows/docker.yaml

@@ -37,9 +37,16 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
+    env:
+      GH_ACCESS_TOKEN: ${{ secrets.REPO_PRIVATE_READ_PAT }}
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+      - name: Run pre-build
+        run: |
+          if test -f "Makefile"; then
+              make ci-pre-build
+          fi
       - name: Docker meta
         id: meta
         uses: docker/metadata-action@v5

RELEASE_NOTES.md

@@ -4,6 +4,7 @@
 
 ### Features
 
+- docker workflow: add `pre-build` step (PR #57 by @cosimomeli)
 - markdown workflow: add optional spell checker (PR #44 by @chicco785)
 - add-to-project workflow: add support to assign multiple teams as reviewers
   (comma separated without space) (PR #42 by @chicco785)