Add re-try logic for linux-surface packages

Even though linux-surface packages are distributed via GitHub (the
repository redirects to GitHub releases for package file downloads),
downloads sporadically fail with as of yet unknown reason. Therefore,
work around this by adding some re-try logic.

lib/modules/linux-surface.sh

@@ -1,5 +1,18 @@
 #!/usr/bin/env bash
 
+__pacman_install_retry() {
+    for i in {1..5}; do
+        if pacman --noconfirm -S "${@}"; then
+            break
+        fi
+
+        local n=$((5 * 2**i))
+
+        echo "failed to install ${*}, trying again in $n seconds"
+        sleep $n
+    done
+}
+
 setup() {
     _msg2 "Adding linux-surface repository..."
 
@@ -18,4 +31,14 @@ EOF
 
     # update
     pacman --noconfirm -Syu
+
+    # WORKAROUND: This is a workaround for an issue with GitHub CI. Normally,
+    # we would install these packages together with the other packages via the
+    # packages/install file, however, when running in CI on GitHub, pacman
+    # regularly fails to download the package files for some reason. We have
+    # not yet figured out why, so as a workaround install the problematic
+    # packages here. If the download/installation fails, wait for a bit and try
+    # again, up to 5 times before giving up.
+    __pacman_install_retry linux-firmware-msft-surface-pro-x linux-firmware-msft-surface-pro-x-qcom
+    __pacman_install_retry linux-surface linux-surface-headers
 }

profiles/default/packages/install

@@ -1,9 +1,5 @@
 base
 base-devel
-linux-surface
-linux-surface-headers
-linux-firmware-msft-surface-pro-x
-linux-firmware-msft-surface-pro-x-qcom
 git
 wget
 iwd