feat: Add a local-debug target (to make for easier debugging)

With this you can make small tweaks to the OpenAPI spec and then run the
following to see the impact:

```
speakeasy run --skip-testing --skip-upload-spec --skip-versioning --target=local-debug
```

Author: rwjblue-glean

.speakeasy/workflow.yaml

@@ -5,6 +5,11 @@ sources:
         inputs:
             - location: registry.speakeasyapi.dev/glean-el2/sdk/glean-api-specs
         output: .speakeasy/glean-merged-spec.yaml
+    local-debug:
+        inputs:
+            - location: .speakeasy/glean-merged-spec.yaml
+        registry:
+            location: registry.speakeasyapi.dev/glean-el2/sdk/local-debug
 targets:
     glean:
         target: python
@@ -20,3 +25,12 @@ targets:
             blocking: false
         testing:
             enabled: true
+    local-debug:
+        target: python
+        source: local-debug
+        codeSamples:
+            labelOverride:
+                fixedValue: Python (API Client)
+            blocking: false
+        testing:
+            enabled: true