chore: only build/test on master branch for host arch

.forgejo/workflows/build.yaml

@@ -1,14 +1,18 @@
-name: Build project
+name: Build and test project
 
 on:
   push:
+    branches:
+      - master
   pull-request:
+    branches:
+      - master
 
 jobs:
 
   build:
 
-    runs-on: [debian-12]
+    runs-on: debian-12
     strategy:
       matrix:
         go-version: [ '1.22' ]
@@ -23,9 +27,9 @@ jobs:
       with:
         go-version: ${{ matrix.go-version }}
 
-    - name: Build plugins for all architectures
+    - name: Build for host architecture
       run: |
-        make build-cross
+        make build
 
     - name: Run tests
       run: |