fix: Use registry.spdy.io for k8s deployments

- Update kubectl set image commands to use HTTPS registry URL
- Fix namespace from cannaiq to dispensary-scraper
- Add guidance on when to use which registry URL

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docs/DOCKER_REGISTRY.md

@@ -1,6 +1,6 @@
-# Using the Local Docker Registry Cache
+# Using the Docker Registry Cache
 
-To avoid Docker Hub rate limits, use our local registry mirror at `10.100.9.70:5000`.
+To avoid Docker Hub rate limits, use our registry at `registry.spdy.io` (HTTPS) or `10.100.9.70:5000` (HTTP internal).
 
 ## For Woodpecker CI (Kaniko builds)
 
@@ -46,10 +46,19 @@ kubectl run cache-image --rm -it --restart=Never \
   -- copy docker.io/library/IMAGE:TAG 10.100.9.70:5000/library/IMAGE:TAG --insecure
 ```
 
+## Which Registry URL to Use
+
+| Context | URL | Why |
+|---------|-----|-----|
+| Kaniko builds (CI) | `10.100.9.70:5000` | Internal HTTP, faster |
+| kubectl set image | `registry.spdy.io` | HTTPS, k8s nodes can pull |
+| Checking images | Either works | Same backend |
+
 ## DO NOT USE
 
 - ~~`--registry-mirror=mirror.gcr.io`~~ - Rate limited by Docker Hub
 - ~~Direct pulls from `docker.io`~~ - Rate limited (100 pulls/6hr anonymous)
+- ~~`10.100.9.70:5000` in kubectl commands~~ - k8s nodes require HTTPS
 
 ## Checking Cached Images