PB-1677: Advertise /search as geo+json

Just having it as `application/json` prevents the STAC Browser from
making use of the search functionality. The STAC Browser only shows:

> Item Search is not supported by this API

And indeed, the STAC specs require the Media Type `application/geo+json`
for [the /search link
relation](https://github.com/radiantearth/stac-api-spec/blob/release/v1.0.0/item-search/README.md?plain=1#L62).

This isn't visible on the deployed STAC Browser because on the deploy
branch `geoadmin_master` there is a fix (`preprocessSTAC`) for this that
replaces the `application/json` with `application/geo+json` on the
browser side, see [this
commit](geoadmin/stac-browser@dae6a0e).
There is a branch `fix_PB-1550_remove_obsolete_preconditioning_hook`
where this was removed again (see [this
commit](geoadmin/stac-browser@30e708a))
but it was never merged.

The browser-side fix, however, is not there on the `main` branch that I
used for local testing. So I noticed that the link relation for /search
is wrong and thus propose the fix here.

It will anyway be probably be nessary for when we use an up-to-date
version of the STAC Browser, see PB-2381. Ideally we would get rid of
the `preprocessSTAC` in the old STAC browser but we can also just throw
it away in the course of updating to the new browser. As I understand
it, `preprocessSTAC` will work no matter what media type it gets.

Author: asteiner-swisstopo

app/stac_api/serializers/general.py

@@ -110,14 +110,14 @@ def to_representation(self, instance):
                 ("href", get_url(request, 'search-list')),
                 ("rel", "search"),
                 ("method", "GET"),
-                ("type", "application/json"),
+                ("type", "application/geo+json"),
                 ("title", "Search across feature collections"),
             ]),
             OrderedDict([
                 ("href", get_url(request, 'search-list')),
                 ("rel", "search"),
                 ("method", "POST"),
-                ("type", "application/json"),
+                ("type", "application/geo+json"),
                 ("title", "Search across feature collections"),
             ]),
         ]

spec/components/responses.yaml

@@ -194,7 +194,7 @@ components:
                 title: Information about the feature collections
               - href: http://data.geo.admin.ch/api/stac/v1/search
                 rel: search
-                type: application/json
+                type: application/geo+json
                 title: Search across feature collections
               - href: http://data.geo.admin.ch/api/stac/v1/sortables
                 rel: http://www.opengis.net/def/rel/ogc/1.0/sortables

spec/static/spec/v1/openapi.yaml

@@ -292,7 +292,7 @@ components:
                 title: Information about the feature collections
               - href: http://data.geo.admin.ch/api/stac/v1/search
                 rel: search
-                type: application/json
+                type: application/geo+json
                 title: Search across feature collections
               - href: http://data.geo.admin.ch/api/stac/v1/sortables
                 rel: http://www.opengis.net/def/rel/ogc/1.0/sortables

spec/static/spec/v1/openapitransactional.yaml

@@ -328,7 +328,7 @@ components:
                 title: Information about the feature collections
               - href: http://data.geo.admin.ch/api/stac/v1/search
                 rel: search
-                type: application/json
+                type: application/geo+json
                 title: Search across feature collections
               - href: http://data.geo.admin.ch/api/stac/v1/sortables
                 rel: http://www.opengis.net/def/rel/ogc/1.0/sortables