chore: include the fixture

Author: everm039

packages/openapi-typescript/test/fixtures/redocly-flag/.gitignore

@@ -1 +1,2 @@
 output
+output-alt

packages/openapi-typescript/test/fixtures/redocly-flag/redocly.alt.yaml

@@ -0,0 +1,16 @@
+extends:
+  - recommended
+
+apis:
+  a@v1:
+    root: ./openapi/a.yaml
+    x-openapi-ts:
+      output: ./output-alt/a.ts
+  b@v1:
+    root: ./openapi/b.yaml
+    x-openapi-ts:
+      output: ./output-alt/b.ts
+  c@v1:
+    root: ./openapi/c.yaml
+    x-openapi-ts:
+      output: ./output-alt/c.ts