feat: integration support for harness

Signed-off-by: Calvin Lee <cjlee@ualberta.ca>

docs/integrations/harness/locations.md

@@ -0,0 +1,33 @@
+---
+id: locations
+title: Harness Locations
+sidebar_label: Locations
+description: Integrating source code stored in Harness Code into the Backstage catalog
+---
+
+The Harness Code integration supports loading catalog entities from a hosted repository. Entities can be added to
+[static catalog configuration](../../features/software-catalog/configuration.md),
+registered with the
+[catalog-import](https://github.com/backstage/backstage/tree/master/plugins/catalog-import)
+plugin.
+
+## Configuration
+
+To use this integration, add configuration to your root `app-config.yaml`:
+
+```yaml
+integrations:
+  harness:
+    - host: app.harness.io
+      token: ${HARNESS_CODE_BEARER_TOKEN}
+```
+
+Directly under the `harnessCode` key is a list of provider configurations, where you
+can list the Gitea instances you want to be able to fetch
+data from. Each entry is a structure with up to four elements:
+
+- `host`: The host of the Harness Code instance that you want to match on.
+- `baseUrl` (optional): Needed if the Harness Code instance is not reachable at
+  the base of the `host` option (e.g. `https://app.harness.io`). This is the address that you would open in a browser.
+- `username` (optional): The gitea username to use in API requests.
+- `token` (optional): The password or api token to authenticate with.