install imagemagick 7 from source (pain!)

.github/workflows/zig-build.yaml

@@ -15,7 +15,14 @@ jobs:
           version: 0.12.0
       - uses: elerch/zig-action-cache@v1.1.6
       - name: Install system dependencies
-        run: apt-get update && apt-get install fonts-hack imagemagick
+        run: |
+          apt-get update 
+          apt-get install fonts-hack # imagemagick (container has imagemagick, but version 6)
+          curl -LOs https://github.com/ImageMagick/ImageMagick/archive/refs/tags/7.1.1-31.tar.gz
+          tar xzf 7.1.1-31.tar.gz
+          cd ImageMagick-7.1.1-31/
+          ./configure && make install && ldconfig /usr/local/lib
+          cd ..
       - name: Build project
         run: zig build --summary all
       - name: Run tests