Fix ubuntu build

Author: pgodwin

.github/workflows/pr-ci.yml

@@ -22,6 +22,11 @@ jobs:
         with:
           go-version-file: go.mod
 
+      - name: Install libpcap headers (Linux)
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y libpcap-dev
+
       - name: Run unit tests
         shell: bash
         run: bash scripts/ci/test.sh
@@ -51,6 +56,12 @@ jobs:
         with:
           go-version-file: go.mod
 
+      - name: Install libpcap headers (Linux)
+        if: runner.os == 'Linux'
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y libpcap-dev
+
       - name: Build omnitalk (Linux/macOS)
         if: runner.os != 'Windows'
         shell: bash

.github/workflows/release-main.yml

@@ -76,6 +76,12 @@ jobs:
         with:
           go-version-file: go.mod
 
+      - name: Install libpcap headers (Linux)
+        if: runner.os == 'Linux'
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y libpcap-dev
+
       - name: Build binary (Linux/macOS)
         if: runner.os != 'Windows'
         shell: bash