[ci] Remove mobile build validation workflow (#7302)

The Android and iOS library builds now run in the android-client and
ios-client repositories, so this workflow duplicates them.

.github/workflows/mobile-build-validation.yml

@@ -1,88 +0,0 @@
-name: Mobile
-
-on:
-  push:
-    branches:
-      - main
-      - "release-*"
-  pull_request:
-
-concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}-${{ github.head_ref || github.actor_id }}
-  cancel-in-progress: true
-
-jobs:
-  android_build:
-    name: "Android / Build"
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
-        with:
-          persist-credentials: false
-      - name: Install Go
-        uses: actions/setup-go@924ae3a1cded613372ab5595356fb5720e22ba16 # v6.5.0
-        with:
-          go-version-file: "go.mod"
-      - name: Setup Android SDK
-        uses: android-actions/setup-android@40fd30fb8d7440372e1316f5d1809ec01dcd3699 # v4.0.1
-        with:
-          cmdline-tools-version: 8512546
-      - name: Setup Java
-        uses: actions/setup-java@1bcf9fb12cf4aa7d266a90ae39939e61372fe520
-        with:
-          java-version: "11"
-          distribution: "adopt"
-      - name: NDK Cache
-        id: ndk-cache
-        uses: actions/cache@2c8a9bd7457de244a408f35966fab2fb45fda9c8 # v6.0.0
-        with:
-          path: /usr/local/lib/android/sdk/ndk
-          key: ndk-cache-23.1.7779620
-      - name: Setup NDK
-        run: /usr/local/lib/android/sdk/cmdline-tools/7.0/bin/sdkmanager --install "ndk;23.1.7779620"
-      - name: install gomobile
-        run: go install golang.org/x/mobile/cmd/gomobile@v0.0.0-20251113184115-a159579294ab
-      # `gomobile init` re-installs gobind from golang.org/x/mobile@latest
-      # regardless of the pin above (cmd/gomobile/init.go: "Make sure gobind is
-      # up to date"), so this step resolves a version nobody chose, on every run.
-      #
-      # setup-go sets GOTOOLCHAIN=local, so that install fails outright once
-      # x/mobile@latest declares a newer Go than go.mod does — which it did on
-      # 2026-08-21, breaking both jobs on every branch at once. GOTOOLCHAIN=auto
-      # lets this one install fetch the toolchain it asks for. Scoped to the
-      # step: the repo's own Go version, and every build below, is unaffected.
-      - name: gomobile init
-        run: gomobile init
-        env:
-          GOTOOLCHAIN: auto
-      - name: build android netbird lib
-        run: PATH=$PATH:$(go env GOPATH) gomobile bind -o $GITHUB_WORKSPACE/netbird.aar -javapkg=io.netbird.gomobile -ldflags="-checklinkname=0 -X golang.zx2c4.com/wireguard/ipc.socketDirectory=/data/data/io.netbird.client/cache/wireguard -X github.com/netbirdio/netbird/version.version=buildtest"  $GITHUB_WORKSPACE/client/android
-        env:
-          CGO_ENABLED: 0
-          ANDROID_NDK_HOME: /usr/local/lib/android/sdk/ndk/23.1.7779620
-  ios_build:
-    name: "iOS / Build"
-    runs-on: macos-latest
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
-        with:
-          persist-credentials: false
-      - name: Install Go
-        uses: actions/setup-go@924ae3a1cded613372ab5595356fb5720e22ba16 # v6.5.0
-        with:
-          go-version-file: "go.mod"
-      - name: install gomobile
-        run: go install golang.org/x/mobile/cmd/gomobile@v0.0.0-20251113184115-a159579294ab
-      # See the Android job: `gomobile init` re-installs gobind from
-      # golang.org/x/mobile@latest regardless of the pin above, and needs a
-      # toolchain it may pick newer than go.mod's.
-      - name: gomobile init
-        run: gomobile init
-        env:
-          GOTOOLCHAIN: auto
-      - name: build iOS netbird lib
-        run: PATH=$PATH:$(go env GOPATH) gomobile bind -target=ios -bundleid=io.netbird.framework -ldflags="-X github.com/netbirdio/netbird/version.version=buildtest" -o ./NetBirdSDK.xcframework ./client/ios/NetBirdSDK
-        env:
-          CGO_ENABLED: 0