add dockerfile for lua language server (#29)

Author: ggilmore

dockerfiles/lua/Dockerfile

@@ -0,0 +1,20 @@
+FROM golang:1.10-alpine
+WORKDIR /go/src/github.com/sourcegraph/lsp-adapter
+COPY . .
+RUN CGO_ENABLED=0 GOBIN=/usr/local/bin go install github.com/sourcegraph/lsp-adapter
+
+# 👀 Add steps here to build the language server itself 👀
+# CMD ["echo", "🚨 This statement should be removed once you have added the logic to start up the language server! 🚨 Exiting..."]
+
+FROM abaez/luarocks:lua5.1
+
+RUN apk add --no-cache ca-certificates git tini
+
+ENTRYPOINT ["/sbin/tini", "--"]
+
+RUN luarocks install --server=http://luarocks.org/dev lua-lsp
+
+COPY --from=0 /usr/local/bin/lsp-adapter /usr/local/bin
+EXPOSE 8080
+# Modify this command to connect to the language server
+CMD ["lsp-adapter", "--trace", "--proxyAddress=0.0.0.0:8080", "lua-lsp"]