[CI] Actions@v4 (#49)

* use v4 of sc actions

* dont build on PR

.github/workflows/nightly.yaml

@@ -2,22 +2,15 @@ name: Nightly Releases
 
 on:
   push:
-    branches: [ dev, ci/nightlies ]
-  pull_request:
-    branches: [ dev ]
+    branches: [ dev, ci/** ]
 
 jobs:
   macbuild:
     runs-on: macos-11
-
     steps:
       - uses: actions/checkout@v2
-
-      - name: setup environment
-        uses: flucoma/actions/env@v2
-
-      - name: build toolkit
-        uses: flucoma/actions/sc@v2
+      - uses: flucoma/actions/env@v4
+      - uses: flucoma/actions/sc@v4
 
       - name: zip release
         run: zip -r ../FluCoMa-SC-Mac-nightly.zip FluidCorpusManipulation
@@ -30,15 +23,10 @@ jobs:
 
   winbuild:
     runs-on: windows-latest
-
     steps:
       - uses: actions/checkout@v2
-
-      - name: setup environment
-        uses: flucoma/actions/env@v2
-
-      - name: build toolkit
-        uses: flucoma/actions/sc@v2
+      - uses: flucoma/actions/env@v4
+      - uses: flucoma/actions/sc@v4
 
       - name: remove pdb files
         run: Remove-Item install -Recurse -Include *.pdb
@@ -53,15 +41,10 @@ jobs:
 
   linuxbuild:
     runs-on: ubuntu-18.04
-
     steps:
       - uses: actions/checkout@v2
-
-      - name: setup environment
-        uses: flucoma/actions/env@v2
-
-      - name: build toolkit
-        uses: flucoma/actions/sc@v2
+      - uses: flucoma/actions/env@v4
+      - uses: flucoma/actions/sc@v4
 
       - name: zip release
         run: zip -r ../FluCoMa-SC-Linux-nightly.zip FluidCorpusManipulation
@@ -75,7 +58,6 @@ jobs:
   release:
     runs-on: ubuntu-latest
     needs: [macbuild, winbuild, linuxbuild]
-
     steps:
       - uses: actions/download-artifact@v2
         with: