Add a (test) mirror skin to the web app

Static assets used by the mirror skin configuration are deployed in
the web service using `docker config` entries; this is not really a practical
solution for a production deployment scheme, but it is simpler for
testing purpose.

conf/assets/logo_partner.svg

+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   id="logo"
+   viewBox="0 0 332 99.78"
+   version="1.1"
+   sodipodi:docname="logo_partner.svg"
+   inkscape:version="1.2.2 (b0a8486541, 2022-12-01)"
+   inkscape:export-filename="logo_partner.png"
+   inkscape:export-xdpi="52.298447"
+   inkscape:export-ydpi="52.298447"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <sodipodi:namedview
+     id="namedview9"
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1.0"
+     inkscape:showpageshadow="2"
+     inkscape:pageopacity="0.0"
+     inkscape:pagecheckerboard="0"
+     inkscape:deskcolor="#d1d1d1"
+     showgrid="false"
+     inkscape:zoom="1.4299821"
+     inkscape:cx="204.54801"
+     inkscape:cy="73.427493"
+     inkscape:window-width="1257"
+     inkscape:window-height="1027"
+     inkscape:window-x="659"
+     inkscape:window-y="22"
+     inkscape:window-maximized="1"
+     inkscape:current-layer="logo" />
+  <defs
+     id="defs4">
+    <style
+       id="style2">
+      .cls-1 {
+        fill: #195ba2;
+      }
+    </style>
+  </defs>
+  <text
+     xml:space="preserve"
+     style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:114.239px;line-height:1.25;font-family:'Latin Modern Sans Quotation';-inkscape-font-specification:'Latin Modern Sans Quotation, Bold';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;fill:#195ba2;fill-opacity:1;stroke-width:1"
+     x="-5.7119098"
+     y="80.537918"
+     id="text346"
+     transform="scale(0.8293716,1.2057321)"><tspan
+       sodipodi:role="line"
+       id="tspan344"
+       x="-5.7119098"
+       y="80.537918"
+       style="fill:#195ba2;fill-opacity:1;stroke-width:1">TEST</tspan></text>
+</svg>

conf/assets/mirror-footer.html

+<a href="https://whatever.sdfa3.org/">TEST</a> &mdash;
+Copyright (C), Software Heritage.
+License: <a href="https://www.gnu.org/licenses/agpl.html">GNU
+AGPLv3+</a>.
+<br/>
+<a href="/legal">Legal notes</a>&nbsp;&nbsp;::&nbsp;
+{% if "swh.web.jslicenses" in SWH_DJANGO_APPS %}
+  <a href="{% url 'jslicenses' %}" rel="jslicense">JavaScript license information</a>
+{% endif %}::&nbsp;
+<a href="{% url 'api-1-homepage' %}">Web API</a>

conf/assets/mirror-homepage.html

+<div class="p-3">
+  <h4>TEST Mirror</h4>
+
+  <p>
+  This is a TEST mirror as part of their commitment
+  to preserving and promoting open-source software, allowing the Software
+  Heritage international network of mirrors to ensure accessibility and
+  preservation of such software for future generations.
+  </p>
+
+</div>

conf/web.yml

@@ -63,3 +63,40 @@ throttling:
         default: 120/h
       exempted_networks:
         - 0.0.0.0/0
+
+
+# Extra configuration for a mirror version of swh-web
+
+# top bar can have custom links and donate link
+top_bar:
+  links:
+    Home: https://whatever.sdfa3.org/
+  # donate_link:
+
+# to display the status.io widget in the top bar
+status:
+  {}
+  # server_url: https://status.example.org/
+  # json_path: 1.0/status/<id>
+
+# matomo can optionally be used
+matomo:
+  {}
+  # url:
+  # site_id:
+
+# most of django apps must be disabled when running a mirror
+swh_extra_django_apps:
+  - swh.web.badges
+  - swh.web.jslicenses
+  - swh.web.vault
+
+show_corner_ribbon: false
+
+# mirror partner specific configuration
+mirror_config:
+  partner_name: "TEST"
+  partner_url: https://whatever.sdfa3.org/
+  static_path: /etc/softwareheritage/mirror/static
+  partner_logo_static_path: logo_partner.png
+  templates_path: /etc/softwareheritage/mirror/templates

mirror.yml

@@ -74,6 +74,12 @@ services:
     configs:
       - source: web
         target: /etc/softwareheritage/config.yml
+      - source: web-mirror-logo
+        target: /etc/softwareheritage/mirror/static/logo_partner.png
+      - source: web-mirror-footer
+        target: /etc/softwareheritage/mirror/templates/mirror-footer.html
+      - source: web-mirror-homepage
+        target: /etc/softwareheritage/mirror/templates/mirror-homepage.html
     command: web
     environment:
       PGCFG_0: swh-web
@@ -575,6 +581,12 @@ configs:
     file: conf/vault-worker.yml
   web:
     file: conf/web.yml
+  web-mirror-logo:
+    file: conf/assets/logo_partner.png
+  web-mirror-footer:
+    file: conf/assets/mirror-footer.html
+  web-mirror-homepage:
+    file: conf/assets/mirror-homepage.html
   search:
     file: conf/search.yml
   search-journal-client: