fix(Dockerfile): remove uses of semicolons

In bash syntax, the semicolon allows the previous command to fail and still run the next command in
the chain. In this case we do not want that to occur as the gunzip/tar/gzip commands are all
tightly coupled together, so if one fails the entire chain should fail.

Dockerfile

@@ -15,7 +15,7 @@ RUN adduser --system \
 	--group \
 	postgres
 
-RUN buildDeps='gcc git libffi-dev libssl-dev python-dev python-pip python-wheel'; \
+RUN buildDeps='gcc git libffi-dev libssl-dev python-dev python-pip python-wheel' && \
     localedef -i en_US -c -f UTF-8 -A /etc/locale.alias en_US.UTF-8 && \
     export DEBIAN_FRONTEND=noninteractive && \
 	apt-key adv --keyserver ha.pool.sks-keyservers.net --recv-keys B97B0AFCAA1A47F044F244A07FCC7D46ACCC4CF8 && \
@@ -44,8 +44,10 @@ RUN buildDeps='gcc git libffi-dev libssl-dev python-dev python-pip python-wheel'
     apt-get autoremove -y && \
     apt-get clean -y && \
     # package up license files if any by appending to existing tar
-    COPYRIGHT_TAR='/usr/share/copyrights.tar'; \
-    gunzip $COPYRIGHT_TAR.gz; tar -rf $COPYRIGHT_TAR /usr/share/doc/*/copyright; gzip $COPYRIGHT_TAR && \
+    COPYRIGHT_TAR='/usr/share/copyrights.tar' && \
+    gunzip $COPYRIGHT_TAR.gz && \
+    tar -rf $COPYRIGHT_TAR /usr/share/doc/*/copyright && \
+    gzip $COPYRIGHT_TAR && \
     rm -rf \
         /usr/share/doc \
         /usr/share/man \