patreon step2: Enable Linux build

I sure as heck don't know what I'm doing :)

patreon_step2: Fix caching

:limesDance: still don't know what I'm doing :limesDance:

.ci/yuzu-patreon-step2.yml

@@ -8,12 +8,37 @@ variables:
   DisplayVersion: $[counter(variables['DisplayPrefix'], 1)]
 
 stages:
-- stage: build
-  displayName: 'build'
+- stage: build_gcc
+  displayName: 'build-gcc'
   jobs:
   - job: build
     timeoutInMinutes: 120
-    displayName: 'windows-msvc'
+    displayName: 'linux'
+    pool:
+      vmImage: ubuntu-latest
+    strategy:
+      maxParallel: 10
+      matrix:
+        linux:
+          BuildSuffix: 'linux'
+          ScriptFolder: 'linux'
+    steps:
+    - template: ./templates/sync-source.yml
+      parameters:
+        artifactSource: $(parameters.artifactSource)
+        needSubmodules: 'true'
+    - template: ./templates/build-single.yml
+      parameters:
+        artifactSource: 'false'
+        cache: $(parameters.cache)
+        version: $(DisplayVersion)
+- stage: build_msvc
+  dependsOn: []
+  displayName: 'build-msvc'
+  jobs:
+  - job: build
+    timeoutInMinutes: 120
+    displayName: 'windows'
     pool:
       vmImage: windows-2019
     steps:
@@ -28,7 +53,9 @@ stages:
         version: $(DisplayVersion)
 - stage: release
   displayName: 'release'
-  dependsOn: build
+  dependsOn:
+  - build_gcc
+  - build_msvc
   jobs:
     - job: release
       displayName: 'source'