Add dependencies required to install psycopg2 from source

We can't install the binaries as they don't support musl

backfiller/Dockerfile

@@ -1,7 +1,7 @@
 FROM alpine:3.7
 # dependencies needed for compiling c extensions
 # also busybox-extras for telnet for easier use of backdoor
-RUN apk --update add py2-pip gcc python-dev musl-dev file make busybox-extras
+RUN apk --update add py2-pip gcc python-dev musl-dev postgresql-dev file make busybox-extras
 
 # Install gevent so that we don't need to re-install it when common changes
 RUN pip install gevent

cutter/Dockerfile

@@ -1,7 +1,7 @@
 FROM alpine:3.7
 # dependencies needed for compiling c extensions
 # also busybox-extras for telnet for easier use of backdoor
-RUN apk --update add py2-pip gcc python-dev musl-dev file make busybox-extras
+RUN apk --update add py2-pip gcc python-dev musl-dev postgresql-dev file make busybox-extras
 
 # Install gevent so that we don't need to re-install it when common changes
 RUN pip install gevent

playlist_manager/Dockerfile

@@ -1,7 +1,7 @@
 FROM alpine:3.7
 # dependencies needed for compiling c extensions
 # also busybox-extras for telnet for easier use of backdoor
-RUN apk --update add py2-pip gcc python-dev musl-dev file make busybox-extras
+RUN apk --update add py2-pip gcc python-dev musl-dev postgresql-dev file make busybox-extras
 
 # Install gevent so that we don't need to re-install it when common changes
 RUN pip install gevent

sheetsync/Dockerfile

@@ -1,7 +1,7 @@
 FROM alpine:3.7
 # dependencies needed for compiling c extensions
 # also busybox-extras for telnet for easier use of backdoor
-RUN apk --update add py2-pip gcc python-dev musl-dev file make busybox-extras
+RUN apk --update add py2-pip gcc python-dev musl-dev postgresql-dev file make busybox-extras
 
 # Install gevent so that we don't need to re-install it when common changes
 RUN pip install gevent

thrimshim/Dockerfile

@@ -1,7 +1,7 @@
 FROM alpine:3.7
 # dependencies needed for compiling c extensions
 # also busybox-extras for telnet for easier use of backdoor
-RUN apk --update add py2-pip gcc python-dev musl-dev file make busybox-extras
+RUN apk --update add py2-pip gcc python-dev musl-dev postgresql-dev file make busybox-extras
 
 # Install gevent so that we don't need to re-install it when common changes
 RUN pip install gevent