chore: add linux-arm.yml workflow for Linux ARM builds

This commit introduces a new GitHub Actions workflow file (linux-arm.yml) for
building and testing Servo on an ARM runner (ubuntu-24.04-arm). The workflow sets up
the environment, builds Servo using an ARM target, and runs unit tests and bencher
jobs when enabled. Note that WPT tests are omitted for ARM as specified.

Signed-off-by: TG <ebiritg@gmail.com>

.github/workflows/linux-arm.yml

@@ -0,0 +1,62 @@
+name: Linux Arm Build and Test
+
+on:
+  workflow_call:
+    inputs:
+      profile:
+        required: true
+        type: string
+      unit-tests:
+        required: true
+        type: boolean
+      build-libservo:
+        required: true
+        type: boolean
+      bencher:
+        required: true
+        type: boolean
+
+
+jobs:
+  linux-arm:
+    name: Linux Arm
+    runs-on: ubuntu-24.04-arm
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 1
+
+      - name: Setup Python
+        uses: ./.github/actions/setup-python
+
+      - name: Setup Rust Toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          override: true
+
+      - name: Bootstrap Dependencies
+        run: |
+          sudo apt update
+          ./mach bootstrap --skip-lints
+
+      - name: Build libservo for ARM
+        run: |
+          # Build for ARM using the appropriate target
+          ./mach build --release --target=aarch64-unknown-linux-gnu
+
+      - name: Run Unit Tests
+        if: ${{ inputs.unit-tests }}
+        run: |
+          ./mach test-unit --release --target=aarch64-unknown-linux-gnu
+
+      - name: Build libservo with examples
+        if: ${{ inputs.build-libservo }}
+        run: cargo build --target=aarch64-unknown-linux-gnu -p libservo --all-targets
+
+      - name: Run Bencher
+        if: ${{ inputs.bencher }}
+        run: |
+          # Replace with the command to run your bencher tests
+          ./mach test-bencher --release -- target=aarch64-unknown-linux-gnu