[CI] do not run windows / OSX for now, run on tag push

.github/workflows/ci.yml

@@ -9,6 +9,8 @@ on:
       - '.github/workflows/ci.yml'
     branches:
       - 'master'
+    tags:
+      - 'v*' # Ensure it runs on tag push as well
   pull_request:
     paths:
       - 'tests/**'
@@ -29,8 +31,8 @@ jobs:
           - 'devel'
         os:
           - ubuntu-latest
-          - windows-latest
-          - macOS-latest
+          #- windows-latest
+          #- macOS-latest
     name: '${{ matrix.nim }} (${{ matrix.os }})'
     steps:
       - name: Checkout
@@ -103,7 +105,8 @@ jobs:
           path: xrayAttenuation/examples/calc_gas_mixtures
 
   release:
-    runs-on: ${{ matrix.os }}
+    if: startsWith(github.ref, 'refs/tags/')
+    runs-on: ubuntu-latest
     needs: build
     strategy:
       fail-fast: false