fix: correct parallel publishing configuration for GitHub Packages

- Fix npm-multiple plugin configuration to use proper pkgRoot for GitHub registry
- Ensure dist-github directory contains complete package structure with scoped package.json
- Copy build artifacts and metadata files to GitHub Packages directory
- Remove conflicting @semantic-release/exec plugin that was causing publish failures
- Properly configure .npmrc with authentication for both registries

This resolves the publishing failures and enables successful dual registry publishing
to both npmjs.org and GitHub Packages with proper scoped package naming.

Author: Mearman

.github/workflows/main.yml

@@ -348,15 +348,19 @@ jobs:
             echo "ℹ️ No README changes to stage"
           fi
         
-      - name: Prepare GitHub Packages package.json
+      - name: Prepare GitHub Packages publishing
         run: |
           echo "📦 Preparing package configuration for GitHub Packages..."
           
-          # Create dist-github directory
+          # Create dist-github directory and copy build artifacts
           mkdir -p dist-github
+          cp -r dist/* dist-github/
           
           # Create a scoped package.json for GitHub Packages
-          jq '.name = "@exadev/markmv" | .publishConfig.registry = "https://npm.pkg.github.com"' package.json > package-github.json
+          jq '.name = "@exadev/markmv" | .publishConfig.registry = "https://npm.pkg.github.com"' package.json > dist-github/package.json
+          
+          # Copy other required files to dist-github
+          cp README.md CHANGELOG.md LICENSE dist-github/ 2>/dev/null || true
           
           echo "✅ GitHub Packages configuration prepared"
           
@@ -381,9 +385,6 @@ jobs:
           @exadev:registry=https://npm.pkg.github.com
           EOF
           
-          # Copy the GitHub-scoped package.json to the directory
-          cp package-github.json dist-github/package.json
-          
           npm run release
           echo "✅ Release completed - packages published to both NPM and GitHub Packages"
           

.releaserc.json

@@ -57,7 +57,7 @@
           "github": {
             "npmPublish": true,
             "tarballDir": "dist-github",
-            "pkgRoot": "./",
+            "pkgRoot": "dist-github",
             "provenance": true,
             "addChannel": false
           }