docker: split into build stages

1 files changed, 13 insertions, 8 deletions

diff --git a/Dockerfile b/Dockerfile
index 7ba79f8..bbd5bad 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,19 +1,24 @@
-FROM alpine:3.14
+FROM alpine:3.14 AS base
 
-RUN build_deps='gcc libffi-dev make musl-dev python3-dev py3-pip' && \
-    runtime_deps='bash git openssh-client python3 tini' && \
-    apk add --no-cache $build_deps $runtime_deps
+FROM base AS build
 
-ARG ssh_sock_dir=/var/run/cgitize
-ARG ssh_sock_path="$ssh_sock_dir/ssh-agent.sock"
-
-ENV SSH_AUTH_SOCK "$ssh_sock_path"
+RUN apk add --no-cache gcc libffi-dev make musl-dev python3-dev py3-pip
 
 COPY ["requirements.txt", "/tmp/"]
 RUN python3 -m venv /tmp/venv && \
     . /tmp/venv/bin/activate  && \
     python3 -m pip install -r /tmp/requirements.txt
 
+FROM base
+
+RUN apk add --no-cache bash git openssh-client python3 tini
+
+COPY --from=build ["/tmp/venv", "/tmp/venv/"]
+
+ARG ssh_sock_dir=/var/run/cgitize
+ARG ssh_sock_path="$ssh_sock_dir/ssh-agent.sock"
+ENV SSH_AUTH_SOCK "$ssh_sock_path"
+
 COPY ["docker/entrypoint.sh", "/"]
 COPY ["cgitize/", "/usr/src/cgitize/"]
 WORKDIR /usr/src