Move 3rd-party dep installation to GH Workflow

**Why this change was necessary**
Different versions of the 3rd-party dependencies are needed for
macOS. Conditionally installing software based on OS is much easier to
manage in the GH Actions workflow than in a shell script.

**What this change does**
Move prelude and dcm2niix installation steps to the GH Workflow.

.github/workflows/tests.yml

@@ -47,13 +47,26 @@ jobs:
         if: contains(matrix.os, 'macos')
         run: brew install dcm2niix
 
-      - name: dcm2niix Linux
+      - name: dcm2niix Ubuntu
         if: contains(matrix.os, 'ubuntu')
         run: |
           curl -JLO https://github.com/rordenlab/dcm2niix/releases/latest/download/dcm2niix_lnx.zip || exit "$?"
           unzip -o dcm2niix_lnx.zip || exit "$?"
           sudo install dcm2nii* /usr/bin/ || exit "$?"
 
+      - name: prelude macOS
+        if: contains(matrix.os, 'macos')
+        run: |
+          echo "Download prelude for macOS"
+          mkdir prelude
+          curl -o prelude/prelude -JL https://github.com/shimming-toolbox/binaries/raw/master/prelude_macos || exit "$?"
+
+      - name: prelude Ubuntu
+        if: contains(matrix.os, 'ubuntu')
+        run: |
+          echo "Download prelude"
+          st_download_data prelude || exit "$?"
+
       - name: Run CI script
         run: ./ci.sh
 

ci.sh

@@ -2,18 +2,17 @@
 
 echo "Installation of dependencies"
 
-
-# Tests
-echo "Download prelude"
-st_download_data prelude || exit "$?"
+# Dependencies
 echo "Set up prelude"
 prelude_path="$(pwd)"/prelude
-chmod 500 "${prelude_path}"/prelude
+chmod +x "${prelude_path}"/prelude
 PATH=${prelude_path}:${PATH}
 export PATH
 FSLOUTPUTTYPE=NIFTI_GZ
 export FSLOUTPUTTYPE
 echo "$PATH"
 st_check_dependencies || exit "$?"
+
+# Unit tests
 echo "Launch general integrity test"
 py.test . -v --cov shimmingtoolbox/ --cov-report term-missing || exit "$?"