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

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

tests/dockerfiles/ConfigUrl.Dockerfile

@@ -0,0 +1,14 @@
+FROM debian:trixie-slim AS target
+FROM interdiode/id-configurator:latest AS configuration
+ARG CONFIG_REPO_PORT
+ARG CONFIG_URL_CACERT_CONTENT
+COPY --from=target / /src/
+RUN id-configurator apply \
+    --config-url "https://host.docker.internal:${CONFIG_REPO_PORT}/config.yaml" \
+    --config-url-cacert-content "$CONFIG_URL_CACERT_CONTENT" \
+    --src /src --dst /dst
+FROM target AS runtime
+COPY --from=configuration /dst/ /
+RUN grep -qx \
+    'test-only certificate fetched via --config-url by the id-configurator integration tests' \
+    /usr/local/share/ca-certificates/config-url-marker.crt