Add a local stack for ERC20 watcher (#80)

* Add a healthcheck for ipld-eth-server

* Update ipld-eth-server ports in mobymask watcher config

* Update clique period to 5s in geth-foundry config

* Add a stack for erc20 watcher

* Add a demo for erc20 watcher

* Upgrade watcher-ts version

* Update instructions

* Pass option to pull while setting up repos

container-build/cerc-watcher-erc20/Dockerfile

@@ -0,0 +1,13 @@
+FROM node:16.17.1-alpine3.16
+
+RUN apk --update --no-cache add git python3 alpine-sdk
+
+WORKDIR /app
+
+COPY . .
+
+RUN echo "Building watcher-ts" && \
+    git checkout v0.2.19 && \
+    yarn && yarn build
+
+WORKDIR /app/packages/erc20-watcher

container-build/cerc-watcher-erc20/build.sh

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+# Build cerc/watcher-erc20
+
+# See: https://stackoverflow.com/a/246128/1701505
+SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
+
+docker build -t cerc/watcher-erc20:local -f ${SCRIPT_DIR}/Dockerfile ${CERC_REPO_BASE_DIR}/watcher-ts