ci: build / release action (#6)

Create docker images on github and docker hub on each
commit to `main`. Create release images on git tag as well
as Github release with executables.

.devcontainer/devcontainer.json

@@ -20,5 +20,15 @@
 	// Configure tool-specific properties.
 	// "customizations": {},
 	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
-	"remoteUser": "root"
+	"remoteUser": "root",
+	"customizations": {
+		"vscode": {
+			"extensions": [
+				"redhat.vscode-yaml",
+				"streetsidesoftware.code-spell-checker",
+				"golang.go",
+				"github.vscode-github-actions"
+			]
+		}
+	}
 }