Installs Linux deps via composite action

Author: mnmaita

.github/workflows/ci.yml

@@ -97,6 +97,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+      - uses: linux/build-deps@v1
       - name: Installs cargo-deadlinks
         run: cargo install cargo-deadlinks
       - name: Checks dead doc links

.github/workflows/linux/build-deps.yml

@@ -0,0 +1,6 @@
+runs:
+  using: "composite"
+  steps:
+    - name: Install alsa and udev
+      run: sudo apt-get update; sudo apt-get install --no-install-recommends libasound2-dev libudev-dev
+      if: runner.os == 'linux'