ci: install pcap for build

.github/workflows/check.yaml

@@ -23,6 +23,9 @@ jobs:
         with:
           go-version: 'stable'
 
+      - name: Install pcap
+        run: sudo apt install -y libpcap-dev
+
       - run: go vet ./...
 
       - name: staticcheck

.github/workflows/release.yaml

@@ -24,6 +24,9 @@ jobs:
         with:
           go-version: "1.22"
 
+      - name: Install pcap
+        run: sudo apt install -y libpcap-dev
+
       - name: Build
         env:
           GOOS: ${{ matrix.goos }}