Fix building standalone image

.gitlab-ci.yml

@@ -41,7 +41,7 @@ build standalone:
   stage: build
   script:
     - docker pull $CI_REGISTRY_IMAGE:standalone || true
-    - docker build --pull --cache-from $CI_REGISTRY_IMAGE:standalone --tag $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA-standalone maubot/standalone
+    - docker build --pull --cache-from $CI_REGISTRY_IMAGE:standalone --tag $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA-standalone . -f maubot/standalone/Dockerfile
     - docker push $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA-standalone
 
 push latest standalone:

maubot/standalone/Dockerfile

@@ -1,6 +1,8 @@
 FROM docker.io/alpine:3.10
 
-RUN apk add --no-cache --virtual .build-deps \
+COPY . /opt/maubot
+RUN cd /opt/maubot \
+  && apk add --no-cache --virtual .build-deps \
       python3-dev \
       libffi-dev \
       build-base \
@@ -9,6 +11,7 @@ RUN apk add --no-cache --virtual .build-deps \
       py3-sqlalchemy \
       py3-attrs \
       py3-bcrypt \
+      py3-cffi \
       ca-certificates \
       su-exec \
       py3-psycopg2 \
@@ -16,5 +19,5 @@ RUN apk add --no-cache --virtual .build-deps \
       py3-jinja2 \
       py3-packaging \
       py3-markdown \
-  && pip3 install maubot \
+  && pip3 install . \
   && apk del .build-deps