ci: don't install swiftshader where not necessary

also allow `workflow_dispatch` so we can launch CI pipelines manually on random branches without opening a PR

Author: Firestar99

.github/workflows/ci.yaml

@@ -4,6 +4,7 @@ on:
       - main
   pull_request:
   merge_group:
+  workflow_dispatch:
 
 name: CI
 
@@ -32,10 +33,6 @@ jobs:
           install_runtime: true
           cache: true
           stripdown: true
-
-          # FIXME(eddyb) consider using lavapipe instead, or even trying both.
-          install_swiftshader: true
-          # install_lavapipe: true
       - if: ${{ runner.os == 'Linux' }}
         name: Linux - Install native dependencies
         run: sudo apt install libwayland-cursor0 libxkbcommon-dev libwayland-dev
@@ -97,10 +94,6 @@ jobs:
           install_runtime: true
           cache: true
           stripdown: true
-
-          # FIXME(eddyb) consider using lavapipe instead, or even trying both.
-          install_swiftshader: true
-          # install_lavapipe: true
       - name: install rust-toolchain
         run: cargo version
       - name: cargo fetch --locked
@@ -145,10 +138,6 @@ jobs:
           install_runtime: true
           cache: true
           stripdown: true
-
-          # FIXME(eddyb) consider using lavapipe instead, or even trying both.
-          install_swiftshader: true
-          # install_lavapipe: true
       - name: install rust-toolchain
         run: echo "TARGET=$(rustc --print host-tuple)" >> "$GITHUB_ENV"
       - name: cargo fetch --locked
@@ -240,10 +229,6 @@ jobs:
           install_runtime: true
           cache: true
           stripdown: true
-
-          # FIXME(eddyb) consider using lavapipe instead, or even trying both.
-          install_swiftshader: true
-          # install_lavapipe: true
       # cargo version is a random command that forces the installation of rust-toolchain
       - name: install rust-toolchain
         run: cargo version