feat: add config-url support with Dockerfile and NGINX configuration

Signed-off-by: d9pouces <github@19pouces.net>

tests/dockerfiles/repos/config-url-config.yaml

@@ -0,0 +1,14 @@
+# Static id-configurator configuration served by the config-url-repo fixture,
+# to be downloaded (not copied in locally) via `id-configurator apply
+# --config-url ... --config-url-cacert-content ...`
+# (tests/dockerfiles/ConfigUrl.Dockerfile). No per-run templating is needed:
+# unlike the module-* fixtures, nothing in this document needs to reference
+# its own server's dynamic host:port.
+uuid: 8f3e4b2c-9a41-4d3e-8f1a-2b6c7d8e9f01
+organisation: InterDiode
+description: Configuration downloaded via --config-url
+configurations:
+  certificates:
+  - name: config-url-marker
+    content: |
+      test-only certificate fetched via --config-url by the id-configurator integration tests

tests/dockerfiles/repos/config-url-repo.Dockerfile

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+# Serves a static id-configurator configuration document over TLS, using the
+# same Test CA as the other *-repo fixtures, used by tox-docker to exercise
+# `id-configurator apply --config-url ... --config-url-cacert-content ...`
+# (tests/dockerfiles/ConfigUrl.Dockerfile).
+#
+# Built by tox-docker, whose build context is this directory (not the repo
+# root) - every COPY source below must live under tests/dockerfiles/repos/.
+FROM nginx:alpine
+COPY config-url-config.yaml /srv/config.yaml
+COPY repo-server.crt.pem /etc/nginx/certs/repo-server.crt.pem
+COPY repo-server.key.pem /etc/nginx/certs/repo-server.key.pem
+COPY config-url-repo.nginx.conf /etc/nginx/conf.d/default.conf
+EXPOSE 8443

tests/dockerfiles/repos/config-url-repo.nginx.conf

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+server {
+    listen 8443 ssl default_server;
+    server_name _;
+
+    ssl_certificate     /etc/nginx/certs/repo-server.crt.pem;
+    ssl_certificate_key /etc/nginx/certs/repo-server.key.pem;
+
+    root /srv;
+    autoindex off;
+}