ci(apt): unify Azure/archive fallback via mirror+file://

Previously the classic /etc/apt/sources.list (jammy) was handled by
duplicating `deb` lines with azure.archive.ubuntu.com first and
archive.ubuntu.com second. apt treats parallel deb lines as independent
sources and fetches InRelease/Packages from both, wasting ~35 MB per
update rather than falling back only when needed.

Switch both the Dockerfile and setup-universe workflow to apt's
`mirror+file://` transport:

- Write /etc/apt/ubuntu-mirrors.list with Azure first, archive second.
- Replace each `http://archive.ubuntu.com/ubuntu` reference (classic or
  deb822) with `mirror+file:///etc/apt/ubuntu-mirrors.list`.

apt reads the list and tries URLs in order, using the first that
responds, so we get true first-win fallback in both sources formats.
security.ubuntu.com is left untouched (separate host, not mirrored on
Azure).

The file-existence guard uses `if [ -f "$f" ]; then ...; fi` rather
than `[ -f "$f" ] && sed ...`: under `sh -e` (the default for GHA
`run:` steps) the `&&` chain short-circuits and returns 1 when the
file doesn't exist, tripping errexit. Only one of the two sources
formats is present on any given Ubuntu version, so the non-matching
iteration would otherwise kill the step.

Verified locally by baking both the humble (jammy / classic
sources.list) and jazzy (noble / deb822) base images end to end; the
apt-get install inside the ansible rmw role succeeded via
mirror+file:// on both.

Signed-off-by: Mete Fatih Cırıt <mfc@autoware.org>

Author: xmfcx

.github/workflows/setup-universe.yaml

@@ -46,12 +46,12 @@ jobs:
           echo 'Acquire::Retries "5";' > /etc/apt/apt.conf.d/99-retries
           echo 'Acquire::http::Timeout "30";' >> /etc/apt/apt.conf.d/99-retries
           echo 'Acquire::https::Timeout "30";' >> /etc/apt/apt.conf.d/99-retries
-          if [ -f /etc/apt/sources.list ]; then
-            sed -i '/^deb http:\/\/archive\.ubuntu\.com\/ubuntu/{h;s|archive\.ubuntu\.com|azure.archive.ubuntu.com|;G}' /etc/apt/sources.list
-          fi
-          if [ -f /etc/apt/sources.list.d/ubuntu.sources ]; then
-            sed -i 's|^URIs: http://archive\.ubuntu\.com/ubuntu|URIs: http://azure.archive.ubuntu.com/ubuntu http://archive.ubuntu.com/ubuntu|' /etc/apt/sources.list.d/ubuntu.sources
-          fi
+          printf 'http://azure.archive.ubuntu.com/ubuntu\nhttp://archive.ubuntu.com/ubuntu\n' > /etc/apt/ubuntu-mirrors.list
+          for f in /etc/apt/sources.list /etc/apt/sources.list.d/ubuntu.sources; do
+            if [ -f "$f" ]; then
+              sed -E -i 's|http://archive\.ubuntu\.com/ubuntu/?|mirror+file:///etc/apt/ubuntu-mirrors.list|g' "$f"
+            fi
+          done
 
       - name: Install dependencies
         run: |

docker-new/base.Dockerfile

@@ -14,12 +14,12 @@ RUN rm -f /etc/apt/apt.conf.d/docker-clean && \
     echo 'Acquire::Retries "5";' > /etc/apt/apt.conf.d/99-retries && \
     echo 'Acquire::http::Timeout "30";' >> /etc/apt/apt.conf.d/99-retries && \
     echo 'Acquire::https::Timeout "30";' >> /etc/apt/apt.conf.d/99-retries && \
-    if [ -f /etc/apt/sources.list ]; then \
-      sed -i '/^deb http:\/\/archive\.ubuntu\.com\/ubuntu/{h;s|archive\.ubuntu\.com|azure.archive.ubuntu.com|;G}' /etc/apt/sources.list; \
-    fi && \
-    if [ -f /etc/apt/sources.list.d/ubuntu.sources ]; then \
-      sed -i 's|^URIs: http://archive\.ubuntu\.com/ubuntu|URIs: http://azure.archive.ubuntu.com/ubuntu http://archive.ubuntu.com/ubuntu|' /etc/apt/sources.list.d/ubuntu.sources; \
-    fi
+    printf 'http://azure.archive.ubuntu.com/ubuntu\nhttp://archive.ubuntu.com/ubuntu\n' > /etc/apt/ubuntu-mirrors.list && \
+    for f in /etc/apt/sources.list /etc/apt/sources.list.d/ubuntu.sources; do \
+      if [ -f "$f" ]; then \
+        sed -E -i 's|http://archive\.ubuntu\.com/ubuntu/?|mirror+file:///etc/apt/ubuntu-mirrors.list|g' "$f"; \
+      fi; \
+    done
 
 RUN --mount=type=cache,id=apt-cache-${ROS_DISTRO},target=/var/cache/apt,sharing=locked \
     --mount=type=cache,id=apt-lists-${ROS_DISTRO},target=/var/lib/apt/lists,sharing=locked \