Install requirements-escrow.txt in Dockerfile

Bumped docker image in size on 100MB, because eospy requirement is a
particular commit with a license and it needs to install git to download it.

Signed-off-by: alfred richardsn <rchrdsn@protonmail.ch>

Dockerfile

@@ -2,6 +2,8 @@ FROM python:3.8-slim-buster
 
 LABEL mantainer="alfred richardsn <rchrdsn@protonmail.ch>"
 
+RUN apt-get update && apt-get install --yes --no-install-recommends git
+
 ARG USER=tellerbot
 ARG GROUP=tellerbot
 
@@ -12,9 +14,11 @@ RUN groupadd -g 999 $GROUP \
 WORKDIR $HOME
 USER $USER:$GROUP
 
-COPY --chown=999:999 requirements.txt .
+COPY --chown=999:999 requirements.txt requirements-escrow.txt ./
 ENV PATH $PATH:$HOME/.local/bin
-RUN pip install --user --no-cache-dir --requirement requirements.txt
+RUN pip install --user --no-cache-dir \
+  --requirement requirements.txt \
+  --requirement requirements-escrow.txt
 
 COPY --chown=999:999 locale/ locale/
 RUN pybabel compile --directory=locale/ --domain=bot