ci: mirror golang:1.25 alongside python:3.12-slim, switch coraza-spoa FROM

Cloudflare's bot-management incident on 2026-05-12 took out docker.io blob
pulls twice in one day — first for python:3.12-slim (mirrored in 5a2ebf9),
then again for golang:1.25 when the PR 1 coraza-spoa build hit the same
R2-via-Cloudflare failure on the build stage's base image.

Restructure .gitea/workflows/mirror-base-image.yaml into a matrix that
iterates over a list of (src, dst_path, tag) entries. Adding a new base
image is now a one-line matrix entry. fail-fast: false so one image's
upstream being down doesn't block refreshing the others.

Switch coraza-spoa/Dockerfile's build stage FROM to the in-house golang
mirror. Runtime FROM (gcr.io/distroless/static-debian12:nonroot) stays
on upstream — distroless is on Google's registry, separate from Docker
Hub's Cloudflare R2 setup, and didn't fail during today's incident.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitea/workflows/mirror-base-image.yaml

@@ -1,22 +1,35 @@
-name: Mirror python:3.12-slim base image
+name: Mirror base images
 run-name: weekly base-image mirror
-# Pulls python:3.12-slim from docker.io and re-pushes it to the in-house
-# registry, so haproxy-manager-base's build (and any future image that
-# uses the same mirror) doesn't depend on docker.io's Cloudflare R2
-# blob storage being reachable. The 2026-05-12 Cloudflare incident
-# motivated this; manual refresh was the workaround at the time.
+
+# Pulls each declared base image from upstream and re-pushes to the in-house
+# registry, so any of our images that FROM these don't depend on docker.io's
+# Cloudflare R2 blob storage being reachable. The 2026-05-12 Cloudflare
+# incident motivated this for python:3.12-slim and again for golang:1.25
+# when the coraza-spoa build hit the same blob-fetch failure.
+#
+# Adding a new mirror = add one entry to the matrix below. The destination
+# tag is always cloud-hosting-platform/<image>:<tag>, matching upstream.
 
 on:
   schedule:
-    # Mondays 06:00 UTC — outside customer peak hours and well before
-    # the typical Tuesday/Thursday push cycles. workflow_dispatch lets us
-    # trigger manually from the Gitea UI when Python publishes patches.
+    # Mondays 06:00 UTC — outside customer peak hours and well before the
+    # typical Tuesday/Thursday push cycles. workflow_dispatch lets us trigger
+    # manually from the Gitea UI when upstream publishes patches.
     - cron: '0 6 * * 1'
   workflow_dispatch:
 
 jobs:
   Mirror-Base:
     runs-on: ubuntu-latest
+    strategy:
+      # fail-fast=false so one image's upstream being down doesn't block the
+      # others from refreshing.
+      fail-fast: false
+      matrix:
+        image:
+          - { src: 'docker.io/library/python:3.12-slim', dst_path: 'cloud-hosting-platform/python', tag: '3.12-slim' }
+          - { src: 'docker.io/library/golang:1.25',      dst_path: 'cloud-hosting-platform/golang', tag: '1.25' }
+
     steps:
       - name: Login to in-house registry
         uses: docker/login-action@v3
@@ -25,11 +38,11 @@ jobs:
           username: ${{ secrets.CI_USER }}
           password: ${{ secrets.CI_TOKEN }}
 
-      - name: Pull, retag, push
+      - name: Pull, retag, push ${{ matrix.image.src }}
         run: |
           set -euo pipefail
-          SRC=docker.io/library/python:3.12-slim
-          DST=repo.anhonesthost.net/cloud-hosting-platform/python:3.12-slim
+          SRC="${{ matrix.image.src }}"
+          DST="repo.anhonesthost.net/${{ matrix.image.dst_path }}:${{ matrix.image.tag }}"
 
           echo "::group::Pulling ${SRC}"
           docker pull "${SRC}"

coraza-spoa/Dockerfile

@@ -11,10 +11,12 @@
 
 ARG CORAZA_SPOA_VERSION=v0.7.1
 
-# golang:1.25 from docker.io. Mirror to repo.anhonesthost.net if Cloudflare
-# reliability becomes a recurring concern (the 2026-05-12 incident drove
-# the same mirror for python:3.12-slim in the parent Dockerfile).
-FROM golang:1.25 AS build
+# golang:1.25 from the in-house mirror. The 2026-05-12 Cloudflare incident
+# took out docker.io blob pulls TWICE in one day (first for python:3.12-slim,
+# then for this image's golang:1.25), so both are mirrored at
+# repo.anhonesthost.net via the .gitea/workflows/mirror-base-image.yaml
+# weekly job.
+FROM repo.anhonesthost.net/cloud-hosting-platform/golang:1.25 AS build
 ARG CORAZA_SPOA_VERSION
 WORKDIR /src
 RUN apt-get update \