build core, basic and go variants and add template

basic/Containerfile

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+FROM code-core
+USER root
+ENV HOME=/root
+
+# Install alpine packages
+RUN apk add --no-cache procps curl curl-doc make make-doc git git-doc
+
+# Install neovim plugins
+WORKDIR /usr/local/share/nvim/site/pack/plugins/opt
+RUN printf '%s\n' \
+  christoomey/vim-tmux-navigator benmills/vimux ap/vim-buftabline \
+  nvim-tree/nvim-tree.lua nvim-tree/nvim-web-devicons ctrlpvim/ctrlp.vim \
+  hrsh7th/nvim-cmp hrsh7th/cmp-buffer hrsh7th/cmp-path hrsh7th/cmp-nvim-lua \
+  hrsh7th/cmp-cmdline hrsh7th/cmp-nvim-lsp neovim/nvim-lspconfig \
+  saadparwaiz1/cmp_luasnip L3MON4D3/LuaSnip jiangmiao/auto-pairs \
+  tpope/vim-surround tpope/vim-repeat kaiuri/nvim-juliana \
+  | xargs -n1 -P0 -I'{}' git clone --depth 1 'https://github.com/{}'
+RUN printf 'helptags %s\n' */doc | nvim --noplugin -es
+
+# Add neovim config
+COPY nvim /etc/xdg/nvim
+
+# Configure environment
+USER 1000:1000
+ENV HOME=/tmp