Change catalyst installation.

Dockerfile

@@ -1,13 +1,21 @@
 FROM python:3.7-alpine
 
-RUN apk add git
-
 RUN apk add --no-cache --virtual .build-deps \
-        gcc musl-dev \
+        git make gcc musl-dev \
-    && pip install snakeoil \
-    && apk del .build-deps
 
-RUN pip install git+https://anongit.gentoo.org/git/proj/catalyst.git
+    # Install deps
+    && pip install snakeoil \
+
+    # Clone catalyst repository
+    && git clone https://anongit.gentoo.org/git/proj/catalyst.git catalyst \
+
+    # Build and install catalyst
+    && cd catalyst \
+    && make \
+    && python -m setup install \
+
+    # Cleanup
+    && apk del .build-deps
 
 # Override Stage3 preclean to add perl-cleaner invocation
 COPY stage3-preclean-chroot.sh \