chore: update container registry to hext-dev

Change GitHub Container Registry references from ghcr.io/coder to
ghcr.io/hext-dev for publishing our fork.

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

Author: hext-dev

.github/workflows/ci.yaml

@@ -111,7 +111,7 @@ jobs:
       - name: Build and Push
         if: github.ref == 'refs/heads/main'
         run: |
-          BASE=ghcr.io/coder/envbuilder-preview
+          BASE=ghcr.io/hext-dev/envbuilder-preview
 
           ./scripts/build.sh \
             --arch=amd64 \

.github/workflows/release.yaml

@@ -59,7 +59,7 @@ jobs:
       - name: Build and Push
         env:
           VERSION: "${{ steps.get-version.outputs.ENVBUILDER_VERSION }}"
-          BASE: "ghcr.io/coder/envbuilder"
+          BASE: "ghcr.io/hext-dev/envbuilder"
         run: |
           ./scripts/build.sh \
             --arch=amd64 \