Add CI to publish docker image (#1)

Part of https://plan.wireit.in/deepstack/browse/VUL-61/

Co-authored-by: Pranav <jadhavpranav89@gmail.com>
Reviewed-on: LaconicNetwork/cosmos-explorer#1

Dockerfile

@@ -0,0 +1,14 @@
+# Originally from: https://github.com/devcontainers/images/blob/main/src/javascript-node/.devcontainer/Dockerfile
+# [Choice] Node.js version (use -bullseye variants on local arm64/Apple Silicon): 18, 16, 14, 18-bullseye, 16-bullseye, 14-bullseye, 18-buster, 16-buster, 14-buster
+ARG VARIANT=20-bullseye
+
+FROM node:${VARIANT}
+
+WORKDIR /app
+
+COPY . .
+
+RUN yarn install
+
+# Expose port for http
+EXPOSE 4173