feat: initial test of flake update

Signed-off-by: silver <silver@skynet.ie>

.forgejo/workflows/update_input.yaml

@@ -0,0 +1,15 @@
+on:
+  workflow_dispatch:
+    inputs:
+      input_to_update:
+        description: 'Flake input to update'
+        required: true
+        type: string
+
+jobs:
+  update:
+    runs-on: nix
+    steps:
+      - uses: actions/checkout@v4
+      - run: nix flake update "${{ inputs.input_to_update }}"
+        shell: bash