Fix TechDocs Edit URL link when trailing slash not present

Signed-off-by: Kamil Markow <kamilmarkow@gmail.com>

.changeset/tricky-rules-destroy.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-techdocs-node': patch
+---
+
+Fix TechDocs Edit URL for nexted docs

plugins/techdocs-node/src/stages/generate/helpers.test.ts

@@ -115,6 +115,7 @@ describe('helpers', () => {
       url                                                                        | repo_url                                                                   | edit_uri
       ${'https://github.com/backstage/backstage'}                                | ${'https://github.com/backstage/backstage'}                                | ${undefined}
       ${'https://github.com/backstage/backstage/tree/main/examples/techdocs/'}   | ${'https://github.com/backstage/backstage/tree/main/examples/techdocs/'}   | ${'https://github.com/backstage/backstage/edit/main/examples/techdocs/docs'}
+      ${'https://github.com/backstage/backstage/tree/main/examples/techdocs'}    | ${'https://github.com/backstage/backstage/tree/main/examples/techdocs'}    | ${'https://github.com/backstage/backstage/edit/main/examples/techdocs/docs'}
       ${'https://github.com/backstage/backstage/tree/main/'}                     | ${'https://github.com/backstage/backstage/tree/main/'}                     | ${'https://github.com/backstage/backstage/edit/main/docs'}
       ${'https://gitlab.com/backstage/backstage'}                                | ${'https://gitlab.com/backstage/backstage'}                                | ${undefined}
       ${'https://gitlab.com/backstage/backstage/-/blob/main/examples/techdocs/'} | ${'https://gitlab.com/backstage/backstage/-/blob/main/examples/techdocs/'} | ${'https://gitlab.com/backstage/backstage/-/edit/main/examples/techdocs/docs'}

plugins/techdocs-node/src/stages/generate/helpers.ts

@@ -117,7 +117,7 @@ export const getRepoUrlFromLocationAnnotation = (
 
       const sourceFolder = integration.resolveUrl({
         url: `./${docsFolder}`,
-        base: target,
+        base: target.endsWith('/') ? target : `${target}/`,
       });
       return {
         repo_url: target,