Install imagemacick in the NPM build

Author: kylecarbs

.github/workflows/publish-npm.yml

@@ -23,6 +23,8 @@ jobs:
           fetch-depth: 0 # Required for git describe to find tags
 
       - uses: ./.github/actions/setup-cmux
+        with:
+          install-imagemagick: 'true'
 
       # Sets up .npmrc with the auth token
       - uses: actions/setup-node@v4