ci: Build both arch and alpine

.builds/alpine.yml

@@ -0,0 +1,11 @@
+image: alpine/edge
+packages:
+  - cargo
+  - linux-pam-dev
+sources:
+  - https://git.sr.ht/~kennylevinsen/greetd
+tasks:
+  - test: |
+      cd greetd
+      cargo check --locked --all-targets --all-features
+      cargo test --locked --all-targets --all-features

.builds/archlinux.yml

@@ -16,4 +16,4 @@ tasks:
   - test: |
       cd greetd
       cargo check --locked --all-targets --all-features
-      cargo test --all-targets --all-features
+      cargo test --locked --all-targets --all-features