[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

.forgejo/workflows/strings.yml

@@ -0,0 +1,22 @@
+name: Check Strings
+
+on:
+  push:
+    branches: [ master ]
+
+jobs:
+  check-strings:
+    runs-on: source
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Find Unused Strings
+        run: ./tools/unused-strings.sh
+
+      - name: Find Stale Translations
+        run: ./tools/stale-translations.sh
+
+      - name: Diff
+        run: git --no-pager diff --exit-code HEAD