Make sure CA certificates are installed for build CI.

Author: michaelrsweet

.github/workflows/build.yml

@@ -24,7 +24,7 @@ jobs:
     - name: Update build environment
       run: sudo apt-get update --fix-missing -y && sudo apt-get upgrade --fix-missing -y
     - name: Install prerequisites
-      run: sudo apt-get install -y avahi-daemon libavahi-client-dev libssl-dev libpam-dev libusb-1.0-0-dev zlib1g-dev
+      run: sudo apt-get install -y avahi-daemon ca-certificates libavahi-client-dev libssl-dev libpam-dev libusb-1.0-0-dev zlib1g-dev
     - name: Configure CUPS
       env:
         CC: /usr/bin/gcc
@@ -55,7 +55,7 @@ jobs:
     - name: Update build environment
       run: sudo apt-get update --fix-missing -y
     - name: Install prerequisites
-      run: sudo apt-get install -y avahi-daemon libavahi-client-dev libgnutls28-dev python3 openssl libpam-dev libusb-1.0-0-dev zlib1g-dev
+      run: sudo apt-get install -y avahi-daemon ca-certificates libavahi-client-dev libgnutls28-dev python3 openssl libpam-dev libusb-1.0-0-dev zlib1g-dev
     - name: Configure CUPS
       env:
         CC: /usr/bin/gcc