ci: install libcairo2-dev on ubuntu-latest

.github/workflows/test.yml

@@ -40,6 +40,9 @@ jobs:
       run: python -m pip install --upgrade pip
     - name: Build and install flydra_core
       run: python -m pip install ./flydra_core
+    - name: Install libcairo2-dev (Ubuntu)
+      if: matrix.os == 'ubuntu-latest'
+      run: sudo apt-get install -y libcairo2-dev
     - name: Build and install flydra_analysis
       run: python -m pip install ./flydra_analysis
 
@@ -55,7 +58,7 @@ jobs:
     - name: Update package index
       run: sudo apt-get update
     - name: Install system packages
-      run: sudo apt-get install -y libcairo2-dev octave # mayavi2 python3-sympy python3-docopt python3-cherrypy3 python3-pkgconfig python-is-python3
+      run: sudo apt-get install -y libcairo2-dev octave
     - name: Upgrade pip
       run: python -m pip install --upgrade pip
     - name: Build and install flydra_core