build core, basic and go variants and add template

go/Containerfile

@@ -0,0 +1,17 @@
+FROM code-basic
+USER root
+ENV HOME=/root
+
+# Install alpine packages
+RUN apk add --no-cache go go-doc
+
+# Install go packages
+ENV GOPATH=/usr/local/lib/go PATH=/usr/local/lib/go/bin:$PATH
+RUN go install golang.org/x/tools/gopls@latest && rm -rf $(go env GOCACHE)
+
+# Add neovim config
+COPY nvim /etc/xdg/nvim
+
+# Configure environment
+USER 1000:1000
+ENV HOME=/tmp