Fix: Replace all tabs in action with spaces

It seems like tab isn't allowed

.github/workflows/build_release.yaml

@@ -2,7 +2,7 @@
 on:
   push:
     tags:
-	- "v*"
+        - "v*"
   # Allows you to run this workflow manually from the Actions tab
   workflow_dispatch:
 
@@ -20,13 +20,13 @@ jobs:
 
       - name: build executable
         run: |
-	  stack build
+          stack build
           find .stack-work/install -name oschark -exec mv {} . \;
       - name: do Release
         uses: softprops/action-gh-release@v1
-      	with:
-	  prerelease: true
-	  files: |
-	  oschark
-	  LICENSE
-	
+        with:
+          prerelease: true
+          files: |
+              oschark
+              LICENSE
+