fix(ci): Use submodules for actions

I've moved to forgejo which uses https://code.forgejo.org/actions/ by
default

.github/workflows/actions/cache-apt-pkgs-action

@@ -0,0 +1 @@
+Subproject commit f2fc6d1af4d6abf8a4dcd37fd74a9a15c2273b9f

.github/workflows/actions/cargo-install

@@ -0,0 +1 @@
+Subproject commit 904927dbe77864e0f2281519fe9d5bd097a220b3

.github/workflows/luacheck.yml

@@ -4,13 +4,16 @@ jobs:
   Luacheck:
     runs-on: ubuntu-latest
     steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          submodules: true
+
       - name: Update repositories
         run: sudo apt update
       - name: Install Luacheck
-        uses: awalsh128/cache-apt-pkgs-action@latest
+        uses: ./.github/workflows/actions/cache-apt-pkgs-action
         with:
           packages: lua-check
-      - name: Checkout
-        uses: actions/checkout@v4
       - name: Luacheck linter
         run: luacheck --config .luacheckrc .

.github/workflows/stylua.yml

@@ -4,20 +4,23 @@ jobs:
   StyLua:
     runs-on: ubuntu-latest
     steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          submodules: true
+
       - name: Update repositories
         run: sudo apt update
       - name: Install cargo
-        uses: awalsh128/cache-apt-pkgs-action@latest
+        uses: ./.github/workflows/actions/cache-apt-pkgs-action
         with:
           packages: cargo libssh2-1
 
       - name: Install StyLua from crates.io
-        uses: baptiste0928/cargo-install@v3
+        uses: ./.github/workflows/actions/cargo-install
         with:
           crate: stylua
           version: 0.20.0
 
-      - name: Checkout
-        uses: actions/checkout@v4
       - name: Check code formatting
         run: stylua -c .

.gitmodules

@@ -0,0 +1,8 @@
+[submodule ".github/workflows/actions/cache-apt-pkgs-action"]
+	path = .github/workflows/actions/cache-apt-pkgs-action
+	url = https://github.com/awalsh128/cache-apt-pkgs-action
+  branch = master
+[submodule ".github/workflows/actions/cargo-install"]
+	path = .github/workflows/actions/cargo-install
+	url = https://github.com/baptiste0928/cargo-install
+  branch = main