chore: simplify Docker image tags

- Main branch push: only push :latest (remove SHA tag)
- Release push: only push release tag name (remove :latest and SHA tag)

.github/workflows/docker-publish.yml

@@ -69,9 +69,7 @@ jobs:
           file: Dockerfile
           push: true
           platforms: linux/amd64,linux/arm64
-          tags: |
-            nousresearch/hermes-agent:latest
-            nousresearch/hermes-agent:${{ github.sha }}
+          tags: nousresearch/hermes-agent:latest
           cache-from: type=gha
           cache-to: type=gha,mode=max
 
@@ -83,9 +81,6 @@ jobs:
           file: Dockerfile
           push: true
           platforms: linux/amd64,linux/arm64
-          tags: |
-            nousresearch/hermes-agent:latest
-            nousresearch/hermes-agent:${{ github.event.release.tag_name }}
-            nousresearch/hermes-agent:${{ github.sha }}
+          tags: nousresearch/hermes-agent:${{ github.event.release.tag_name }}
           cache-from: type=gha
           cache-to: type=gha,mode=max