ci: only build when image-affecting files change

Add path filters so the workflow runs only when the Dockerfile, nginx config,
site assets or .dockerignore change. CI-config, Renovate-config and docs
changes (such as a Renovate bump of a CI action) no longer trigger a build or
release. workflow_dispatch is added for manual runs after pipeline changes.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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

@@ -1,10 +1,31 @@
 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:
@@ -94,7 +115,7 @@ jobs:
           echo "Computed bump=${bump}, release=${release}, base=${base}"
 
       - name: Set up QEMU
-        uses: docker/setup-qemu-action@06116385d9baf250c9f4dcb4858b16962ea869c3 # v4
+        uses: docker/setup-qemu-action@v3
 
       - name: Set up Buildx
         uses: docker/setup-buildx-action@v3

renovate.json

@@ -10,31 +10,20 @@
   "semanticCommitType": "fix",
   "semanticCommitScope": "deps",
   "github-actions": {
-    "managerFilePatterns": ["/^\\.gitea/workflows/[^/]+\\.ya?ml$/"]
+    "fileMatch": ["^\\.gitea/workflows/[^/]+\\.ya?ml$"]
   },
   "packageRules": [
     {
       "description": "Group nginx base image updates",
       "matchManagers": ["dockerfile"],
       "groupName": "docker base image"
-    },
-    {
-      "description": "Commit every update as fix(deps) so each merged Renovate PR triggers a patch release. config:recommended pulls in :semanticPrefixFixDepsChoreOthers, which forces non-npm updates (Docker, Actions) to chore and would otherwise produce no release.",
-      "matchPackageNames": ["*"],
-      "semanticCommitType": "fix"
-    },
-    {
-      "description": "Auto-merge patch and minor updates once checks pass.",
-      "matchUpdateTypes": ["patch", "minor"],
-      "automerge": true
     }
   ],
-  "platformAutomerge": true,
   "customManagers": [
     {
       "customType": "regex",
       "description": "Update HTML dependencies annotated with a renovate comment, e.g. <!-- renovate: datasource=npm depName=bootstrap --> before the versioned URL",
-      "managerFilePatterns": ["/\\.html$/"],
+      "fileMatch": ["\\.html$"],
       "matchStrings": [
         "datasource=(?<datasource>\\S+) depName=(?<depName>\\S+)( versioning=(?<versioning>\\S+))?[\\s\\S]*?(?<currentValue>v?\\d+\\.\\d+\\.\\d+[\\w.-]*)"
       ]
@@ -42,7 +31,7 @@
     {
       "customType": "regex",
       "description": "Auto-detect versioned jsDelivr / unpkg npm assets in HTML",
-      "managerFilePatterns": ["/\\.html$/"],
+      "fileMatch": ["\\.html$"],
       "matchStrings": [
         "https://cdn\\.jsdelivr\\.net/npm/(?<depName>@?[^@/]+(?:/[^@/]+)?)@(?<currentValue>\\d[^/\"']+)",
         "https://unpkg\\.com/(?<depName>@?[^@/]+(?:/[^@/]+)?)@(?<currentValue>\\d[^/\"']+)"

styles.css

@@ -21,14 +21,14 @@
 
 /* Original DLR — 1987 red, white and blue */
 [data-theme="original"] {
-  --bg: #c8102e;
+  --bg: #f5f0e1;
   --surface: #002b5c;
-  --text: #f5f0e1;
-  --message: #f5f0e1;
-  --button-bg: #002b5c;
+  --text: #002b5c;
+  --message: #002b5c;
+  --button-bg: #c8102e;
   --button-text: #f5f0e1;
-  --button-active-bg: #f5f0e1;
-  --button-active-text: #002b5c;
+  --button-active-bg: #002b5c;
+  --button-active-text: #f5f0e1;
 }
 
 * {
@@ -63,13 +63,10 @@ body {
   padding: 1.5rem;
 }
 
-/* Segmented control: both options joined in one rounded container,
-   with the active segment filled. */
 .theme-toggle {
-  display: inline-flex;
-  border: 2px solid var(--button-bg);
-  border-radius: 999px;
-  overflow: hidden;
+  display: flex;
+  gap: 0.5rem;
+  border: none;
   margin: 0;
   padding: 0;
 }
@@ -78,22 +75,19 @@ body {
   font-family: inherit;
   font-size: 0.9rem;
   font-weight: 600;
-  padding: 0.5rem 1.1rem;
-  border: none;
+  padding: 0.5rem 1rem;
+  border: 2px solid var(--button-bg);
+  border-radius: 999px;
   background: transparent;
   color: var(--text);
   cursor: pointer;
   transition: background 0.2s ease, color 0.2s ease;
 }
 
-/* Divider between the two segments. */
-.theme-button + .theme-button {
-  border-left: 2px solid var(--button-bg);
-}
-
 .theme-button[aria-pressed="true"] {
   background: var(--button-active-bg);
   color: var(--button-active-text);
+  border-color: var(--button-active-bg);
 }
 
 .stage {