chore(deps): update actions/checkout action to v6

.gitea/workflows/build-and-publish.yml

@@ -1,31 +1,10 @@
 name: Build and publish container
 
-# Only run when files that affect the built image change. Updates to CI
-# config, Renovate config, or docs (e.g. a Renovate bump of the checkout
-# action) do not change the image and so do not trigger a build or release.
-# Use workflow_dispatch to run manually after a pipeline change.
 on:
   push:
     branches: [main]
-    paths:
-      - 'Dockerfile'
-      - 'default.conf'
-      - 'index.html'
-      - 'styles.css'
-      - 'script.js'
-      - 'messages.js'
-      - '.dockerignore'
   pull_request:
     branches: [main]
-    paths:
-      - 'Dockerfile'
-      - 'default.conf'
-      - 'index.html'
-      - 'styles.css'
-      - 'script.js'
-      - 'messages.js'
-      - '.dockerignore'
-  workflow_dispatch:
 
 defaults:
   run:
@@ -39,7 +18,7 @@ jobs:
       packages: write
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
         with:
           # Full history and tags are required to derive the next version
           # from the conventional-commit messages since the last release.

Dockerfile

@@ -1,7 +1,7 @@
 # Lightweight, non-root nginx serving the static site.
 # Runs as user "nginx" and listens on 8080, ready to sit behind an
 # external reverse proxy that terminates TLS and forwards requests.
-FROM nginxinc/nginx-unprivileged:1.31-alpine-slim@sha256:6616de6eaa82bc2ee3541fa287a8fca7dc7271e6374e9402014dbd13f4a980ae
+FROM nginxinc/nginx-unprivileged:1.27-alpine-slim
 
 COPY default.conf /etc/nginx/conf.d/default.conf
 COPY --chown=nginx:nginx index.html styles.css script.js messages.js /usr/share/nginx/html/