[ci] Move workflows to .forgejo (#3808)

Primarily to prevent mirrors from trying to run bogus actions.

Signed-off-by: crueter <crueter@eden-emu.dev>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3808

.github/workflows/license-header.yml

@@ -1,22 +0,0 @@
-name: eden-license
-
-on:
-  pull_request:
-    branches: [ master ]
-
-jobs:
-  license-header:
-    runs-on: source
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          fetch-depth: 0
-
-      - name: Fetch
-        run: git fetch origin master:master
-
-      - name: Make script executable
-        run: chmod +x ./.ci/license-header.sh
-
-      - name: Check license headers
-        run: ./.ci/license-header.sh