Dockerfile (#1)

* Initial work for adding a Dockerfile and creating an image for inspector

Fixes #237

* Updating workflow to publish to GitHub Container Registry

Using guide from https://docs.github.com/en/actions/use-cases-and-examples/publishing-packages/publishing-docker-images

.dockerignore

@@ -0,0 +1,35 @@
+# Version control
+.git
+.gitignore
+
+# Node.js
+node_modules
+npm-debug.log
+
+# Build artifacts
+client/dist
+client/build
+server/dist
+server/build
+
+# Environment variables
+.env
+.env.local
+.env.development
+.env.test
+.env.production
+
+# Editor files
+.vscode
+.idea
+
+# Logs
+logs
+*.log
+
+# Testing
+coverage
+
+# Docker
+Dockerfile
+.dockerignore