Add a container for ERC20 contract txs in the payments stack (#591)

* Add a container for ERC20 contract txs in the payments stack

* Use erc20-watcher-ts repo in erc20 stack

app/data/container-build/cerc-watcher-erc20/Dockerfile

@@ -1,13 +1,10 @@
 FROM node:16.17.1-alpine3.16
 
-RUN apk --update --no-cache add git python3 alpine-sdk
+RUN apk --update --no-cache add git python3 alpine-sdk bash curl jq
 
 WORKDIR /app
 
 COPY . .
 
-RUN echo "Building watcher-ts" && \
-    git checkout v0.2.19 && \
+RUN echo "Building erc20-watcher-ts" && \
     yarn && yarn build
-
-WORKDIR /app/packages/erc20-watcher