Try a different multi-stage Dockerfile approach

The current Dockerfile fails to produce a valid image, there's an odd
bug where we are pushing what looks like an intermediate to the registry.

Dockerfile

-FROM registry.git.autistici.org/ai3/docker/s6-base:master AS fbl-base
+FROM debian:bullseye-slim AS build
+ADD . /src
+WORKDIR /src
 RUN apt-get -q update && \
     env DEBIAN_FRONTEND=noninteractive apt-get -qy install --no-install-recommends \
         python3-flask python3-sqlalchemy python3-flask-sqlalchemy python3-cheroot \
         python3-setuptools python3-pip && \
     apt-get clean && \
-    rm -fr /var/lib/apt/lists/*
-
-FROM fbl-base AS build
-ADD . /src
-WORKDIR /src
-RUN python3 setup.py bdist_wheel
+    rm -fr /var/lib/apt/lists/* && \
+    python3 setup.py bdist_wheel
 
-FROM fbl-base
+FROM registry.git.autistici.org/ai3/docker/s6-base:master
 COPY --from=build /src/dist/*.whl /tmp/wheels/
 COPY conf/ /etc/
 COPY feedbackloop.sh /usr/local/bin/feedbackloop
-RUN cd /tmp/wheels && pip3 install *.whl && rm -fr /tmp/wheels
+RUN apt-get -q update && \
+    env DEBIAN_FRONTEND=noninteractive apt-get -qy install --no-install-recommends \
+        python3-flask python3-sqlalchemy python3-flask-sqlalchemy python3-cheroot \
+        python3-setuptools python3-pip && \
+    apt-get clean && \
+    rm -fr /var/lib/apt/lists/* && \
+    cd /tmp/wheels && pip3 install *.whl && rm -fr /tmp/wheels

Dockerfile.multistage

+FROM registry.git.autistici.org/ai3/docker/s6-base:master AS fbl-base
+RUN apt-get -q update && \
+    env DEBIAN_FRONTEND=noninteractive apt-get -qy install --no-install-recommends \
+        python3-flask python3-sqlalchemy python3-flask-sqlalchemy python3-cheroot \
+        python3-setuptools python3-pip && \
+    apt-get clean && \
+    rm -fr /var/lib/apt/lists/*
+
+FROM fbl-base AS build
+ADD . /src
+WORKDIR /src
+RUN python3 setup.py bdist_wheel
+
+FROM fbl-base
+COPY --from=build /src/dist/*.whl /tmp/wheels/
+COPY conf/ /etc/
+COPY feedbackloop.sh /usr/local/bin/feedbackloop
+RUN cd /tmp/wheels && pip3 install *.whl && rm -fr /tmp/wheels

feedbackloop/model.py

@@ -6,6 +6,6 @@ class FeedbackEntry(db.Model):
     id = db.Column(db.Integer, primary_key=True)
     sender = db.Column(db.Text, index=True)
     reporter = db.Column(db.Text)
-    is_list = db.Column(db.Boolean)
+    is_list = db.Column(db.Boolean, index=True)
     message = db.Column(db.Text)
     timestamp = db.Column(db.DateTime)