chore: gh action improvements

Author: 0xItadaki

.github/workflows/coverage.yml

@@ -3,6 +3,10 @@ name: Coverage Check
 on:
   pull_request:
 
+concurrency:
+  group: coverage-${{ github.event.pull_request.number }}
+  cancel-in-progress: true
+
 env:
   COVERAGE_SENSITIVITY_PERCENT: 1
   MAINNET_RPC: ${{ secrets.MAINNET_RPC }}
@@ -101,11 +105,10 @@ jobs:
           else
             old=0
           fi
-          # Floor decimals to integer for comparison
-          old_int=${old%.*}
-          new=$(( ${{ steps.new-coverage.outputs.total-coverage }} + ${{ env.COVERAGE_SENSITIVITY_PERCENT }} ))
-          if [ "$new" -lt "$old_int" ]; then
-            echo "Coverage decreased from $old_int to $new"
+          new_total=${{ steps.new-coverage.outputs.total-coverage }}
+          new=$(awk -v a="$new_total" -v b="${{ env.COVERAGE_SENSITIVITY_PERCENT }}" 'BEGIN{printf "%.2f", a+b}')
+          if awk "BEGIN {exit !($new < $old)}"; then
+            echo "Coverage decreased from $old to $new"
             exit 1
           fi
           mv lcovNew.info coverage.info