pillow dependencies (#535)

Author: chriswedgwood

.github/workflows/pythonpackage.yml

@@ -24,8 +24,12 @@ jobs:
         # needed because the postgres container does not provide a healthcheck
         options: --health-cmd pg_isready --health-interval 10s --health-timeout 5s --health-retries 5
     steps:
-      - name: psycopg2 prerequisites
-        run: sudo apt-get install python3-dev libpq-dev
+      - name: Install system packages for Pillow and psycopg2
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y python3-dev libpq-dev libjpeg-dev zlib1g-dev \
+            libfreetype6-dev liblcms2-dev libwebp-dev libtiff5-dev \
+            libopenjp2-7-dev tk-dev tcl-dev
       - uses: actions/checkout@v1
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v1