remove fdroid, no idea why do we need this.

.github/workflows/fdroid.yml

@@ -1,31 +0,0 @@
-name: Fdroid 
-
-on:
-  workflow_dispatch:
-  push:
-    tags:
-      - 'v[0-9]+.[0-9]+.[0-9]+'
-      - '[0-9]+.[0-9]+.[0-9]+'
-      - 'v[0-9]+.[0-9]+.[0-9]+-[0-9]+'
-      - '[0-9]+.[0-9]+.[0-9]+-[0-9]+'
-
-jobs:
-  update-fdroid-version-file:
-    name: Publish RustDesk version file for F-Droid updater
-    runs-on: ubuntu-latest
-    steps:
-      - name: Generate RustDesk version file
-        run: |
-          UPSTREAM_VERNAME="$GITHUB_REF_NAME"
-          UPSTREAM_VERCODE="$(echo "$UPSTREAM_VERNAME" | tr -d '.')"
-          echo "versionName=$UPSTREAM_VERNAME"  > rustdesk-version.txt
-          echo "versionCode=$UPSTREAM_VERCODE" >> rustdesk-version.txt
-        shell: bash
-
-      - name: Publish RustDesk version file
-        uses: softprops/action-gh-release@v1
-        with:
-          prerelease: true
-          tag_name: "fdroid-version"
-          files: |
-            ./rustdesk-version.txt