chore: Update Snort test script and Dockerfile for improved reliabili…

…ty and readability

.github/workflows/snort-build.yml

@@ -1,10 +1,11 @@
 name: Build Snort
 
 on:
-  push:
+  pull_request:
     branches:
-      - '*'
+      - 'develop'
     paths:
+      - 'snort/**'
       - '.github/workflows/snort-build.yml'
 
 env:
@@ -58,6 +59,8 @@ jobs:
       - name: Build and push
         uses: docker/build-push-action@v4
         with:
+          context: ./snort
+          file: ./Dockerfile
           push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}