fix(ci): Use full URLs for CI Actions

Forgejo uses https://code.forgejo.org not https://github.com as the
default path

.github/workflows/check.yml

@@ -11,13 +11,13 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Install nix
-        uses: DeterminateSystems/nix-installer-action@main
+        uses: https://github.com/DeterminateSystems/nix-installer-action@main
       - name: Setup Action cache for nix
-        uses: DeterminateSystems/magic-nix-cache-action@main
+        uses: https://github.com/DeterminateSystems/magic-nix-cache-action@main
         with:
           fail-mode: true
       - name: Check Nix flake inputs
-        uses: DeterminateSystems/flake-checker-action@v4 # This action
+        uses: https://github.com/DeterminateSystems/flake-checker-action@v4 # This action
       - name: Run nix fmt
         run: nix fmt -- --check .
 
@@ -26,13 +26,13 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Install nix
-        uses: DeterminateSystems/nix-installer-action@main
+        uses: https://github.com/DeterminateSystems/nix-installer-action@main
       - name: Setup Action cache for nix
-        uses: DeterminateSystems/magic-nix-cache-action@main
+        uses: https://github.com/DeterminateSystems/magic-nix-cache-action@main
         with:
           fail-mode: true
       - name: Check Nix flake inputs
-        uses: DeterminateSystems/flake-checker-action@v4 # This action
+        uses: https://github.com/DeterminateSystems/flake-checker-action@v4 # This action
       - name: Run nix flake check
         run: nix flake check
 
@@ -41,12 +41,12 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Install nix
-        uses: DeterminateSystems/nix-installer-action@main
+        uses: https://github.com/DeterminateSystems/nix-installer-action@main
       - name: Setup Action cache for nix
-        uses: DeterminateSystems/magic-nix-cache-action@main
+        uses: https://github.com/DeterminateSystems/magic-nix-cache-action@main
         with:
           fail-mode: true
       - name: Check Nix flake inputs
-        uses: DeterminateSystems/flake-checker-action@v4 # This action
+        uses: https://github.com/DeterminateSystems/flake-checker-action@v4 # This action
       - name: Build nvim
         run: nix build .\#default

.github/workflows/update.yml

@@ -11,13 +11,13 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
       - name: Install nix
-        uses: DeterminateSystems/nix-installer-action@main
+        uses: https://github.com/DeterminateSystems/nix-installer-action@main
       - name: Setup Action cache for nix
-        uses: DeterminateSystems/magic-nix-cache-action@main
+        uses: https://github.com/DeterminateSystems/magic-nix-cache-action@main
         with:
           fail-mode: true
       - name: Update flake.lock
-        uses: DeterminateSystems/update-flake-lock@main
+        uses: https://github.com/DeterminateSystems/update-flake-lock@main
         with:
           # inputs: dzgui dzgui-testing # We'll see whether I want to limit the updates to dzgui
           token: ${{ secrets.FORGEJO_TOKEN_FOR_UPDATES }}