Moves reusable actions to .github

Author: mrdimidium

.github/workflows/library.yml

@@ -11,4 +11,4 @@ on:
 jobs:
   build:
     name: Build and test library
-    uses: zig-devel/.infra/.github/workflows/library.yml@main
+    uses: zig-devel/.github/.github/workflows/library.yml@main

.github/workflows/release.yml

@@ -7,6 +7,6 @@ on:
 jobs:
   release:
     name: Prepare GitHub release
-    uses: zig-devel/.infra/.github/workflows/release.yml@main
+    uses: zig-devel/.github/.github/workflows/release.yml@main
     permissions:
       contents: write