Add sndfile dependency to tests and docker image

.github/workflows/build.yml

@@ -16,6 +16,10 @@ jobs:
         with:
           python-version: 3.6
 
+      - name: Install dependencies - Linux
+        run: apt-get install libsndfile1
+        if: matrix.os == "ubuntu-latest"
+
       - name: Install dependencies - MacOS
         run: brew install libomp
         if: matrix.os == 'macos-latest'

docker/api.Dockerfile

@@ -11,7 +11,7 @@ EXPOSE 8000
 
 # Install required packages
 RUN apt-get update && \
-    apt-get -y --no-install-recommends install libgomp1 gcc g++ python3.6 python3-dev python3-pip && \
+    apt-get -y --no-install-recommends install libgomp1 libsndfile1 gcc g++ python3.6 python3-dev python3-pip && \
     rm -rf /var/lib/apt/lists
 
 # Install paperetl project and dependencies