build: maximally fix the dockerfile

Dockerfile

@@ -1,40 +1,34 @@
-FROM ubuntu:22.04
+FROM alpine:3.17.2 as runtime
 
 ENV APPHOME /opt/readalong-studio
 ENV PORT 5000
 
 # Lean, optimized installation of system dependencies
-RUN apt-get update \
-    && DEBIAN_FRONTEND=noninteractive apt-get install --no-install-recommends --yes \
-        python3 \
-        python3-pip \
-        git \
-        ffmpeg \
-        vim-nox \
-	less \
-    && apt-get clean \
-    && apt-get autoremove \
-    && rm -fr /var/lib/apt/lists/*
+RUN apk add python3 py3-numpy py3-yaml git ffmpeg
 
-# Install 3rd party dependencies in their own layer, for faster rebuilds when we
-# change ReadAlong-Studio source code
-ADD requirements.* $APPHOME/
-RUN python3 -m pip install --upgrade pip \
-    && python3 -m pip install -r $APPHOME/requirements.txt \
-    && python3 -m pip install gevent
-
-# We don't want Docker to cache the installation of g2p or Studio, so place them
-# after COPY . $APPHOME, which almost invariable invalidates the cache.
-COPY . $APPHOME
+FROM runtime as build
 WORKDIR $APPHOME
-# Get and install the latest g2p
-RUN git clone https://github.com/roedoejet/g2p.git \
-    && cd g2p \
+RUN apk add python3-dev py3-pip gcc g++ musl-dev ninja
+RUN python3 -m venv --system-site-packages $APPHOME/venv
+RUN git clone https://github.com/roedoejet/g2p.git
+COPY requirements*.txt $APPHOME/
+RUN . $APPHOME/venv/bin/activate \
+    && python3 -m pip install -r $APPHOME/requirements.txt
+RUN cd $APPHOME/g2p \
+    && . $APPHOME/venv/bin/activate python3 -m pip install -e .
+# Do this after all the above so we don't needlessly rebuild
+COPY . $APPHOME/Studio
+RUN cd $APPHOME/Studio \
+    && . $APPHOME/venv/bin/activate \
     && python3 -m pip install -e .
 
-# Install ReadAlong-Studio itself
-RUN python3 -m pip install -e .
+FROM runtime
+COPY --from=build $APPHOME $APPHOME
+WORKDIR $APPHOME
+ENV VIRTUAL_ENV $APPHOME/venv
+ENV PATH $VIRTUAL_ENV/bin:$PATH
 
-# For the web API, use this CMD instead, the same on our Heroku deployment, except
-# with binding to port 5000
+# For the web API, use this CMD, the same on our Heroku deployment, except
+# with binding to port 5000.  Set ORIGIN to the base URL of your Studio-Web.
+# ENV ORIGIN https://localhost:4200/
 # CMD gunicorn -w 4 -k uvicorn.workers.UvicornWorker readalongs.web_api:web_api_app --bind 0.0.0.0:$PORT

requirements.min.txt

@@ -10,5 +10,5 @@ numpy>=1.16.4
 pydub==0.23.1
 pympi-ling==1.69
 python-slugify==5.0.0
-soundswallower~=0.4.1
+soundswallower~=0.6.0
 webvtt-py==0.4.2