updating variable syntax and pinning botocore version

Dockerfile

@@ -2,13 +2,11 @@ ARG AZLINUX_BASE_VERSION=master
 
 FROM quay.io/cdis/python-nginx-al:${AZLINUX_BASE_VERSION} AS base
 
-# FROM 707767160287.dkr.ecr.us-east-1.amazonaws.com/gen3/python-nginx-al2:feat_python-nginx AS base
-
 ENV appname=peregrine
 
 WORKDIR /${appname}
 
-RUN chown -R gen3:gen3 /$appname
+RUN chown -R gen3:gen3 /${appname}
 
 # Builder stage
 FROM base AS builder
@@ -19,22 +17,22 @@ COPY poetry.lock pyproject.toml /${appname}/
 
 RUN poetry install -vv --only main --no-interaction
 
-COPY --chown=gen3:gen3 . /$appname
+COPY --chown=gen3:gen3 . /${appname}
 
 # Run poetry again so this app itself gets installed too
 RUN poetry install --without dev --no-interaction
 
-RUN git config --global --add safe.directory /${appname} && COMMIT=`git rev-parse HEAD` && echo "COMMIT=\"${COMMIT}\"" > /$appname/version_data.py \
-    && VERSION=`git describe --always --tags` && echo "VERSION=\"${VERSION}\"" >> /$appname/version_data.py
+RUN git config --global --add safe.directory /${appname} && COMMIT=`git rev-parse HEAD` && echo "COMMIT=\"${COMMIT}\"" > /${appname}/version_data.py \
+    && VERSION=`git describe --always --tags` && echo "VERSION=\"${VERSION}\"" >> /${appname}/version_data.py
 
 # Final stage
 FROM base
 
-COPY --from=builder /$appname /$appname
+COPY --from=builder /${appname} /${appname}
 
 # Switch to non-root user 'gen3' for the serving process
 USER gen3
 
-WORKDIR /$appname
+WORKDIR /${appname}
 
 CMD ["/bin/bash", "-c", "/${appname}/dockerrun.bash"]