GHA: Fix strip failing in Linux ARM64 builds

.github/actions/setup-linux-toolchain/action.yml

@@ -15,6 +15,9 @@ runs:
         TOOLCHAIN_64_SHA=16c8302fcb676c1f0fb9df73d6cff250ba1f4286
         TOOLCHAIN_32_URL=https://github.com/godotengine/buildroot/releases/download/godot-2020.11.x-2/i686-godot-linux-gnu_sdk-buildroot.tar.bz2
         TOOLCHAIN_32_SHA=6171652abc54ef219e5187bc53660ee4e2f796f4
+        TOOLCHAIN_ARM64_URL=https://github.com/godotengine/buildroot/releases/download/godot-2023.08.x-3/aarch64-godot-linux-gnu_sdk-buildroot.tar.bz2
+        TOOLCHAIN_ARM64_SHA=73bed3d26b92c8b9a93c0ceb6bcce8fe567d1764
+
         # ! Export variables:
         if [[ "${{ inputs.arch }}" == "x86_64" ]]; then
           echo "TOOLCHAIN_URL=${TOOLCHAIN_64_URL}" >> "$GITHUB_ENV"
@@ -22,6 +25,9 @@ runs:
         elif [[ "${{ inputs.arch }}" == "x86_32" ]]; then
           echo "TOOLCHAIN_URL=${TOOLCHAIN_32_URL}" >> "$GITHUB_ENV"
           echo "TOOLCHAIN_SHA=${TOOLCHAIN_32_SHA}" >> "$GITHUB_ENV"
+        elif [[ "${{ inputs.arch }}" == "arm64" ]]; then
+          echo "TOOLCHAIN_URL=${TOOLCHAIN_ARM64_URL}" >> "$GITHUB_ENV"
+          echo "TOOLCHAIN_SHA=${TOOLCHAIN_ARM64_SHA}" >> "$GITHUB_ENV"
         fi
 
     - name: Cache buildroot

.github/workflows/linux.yml

@@ -231,7 +231,11 @@ jobs:
         env:
           OUTDIR: ${{ startsWith(matrix.opts.target, 'template') && 'out/templates' || 'out/' }}
         run: |
-          strip ./bin/godot.*
+          if [ "${{matrix.opts.arch}}" == "arm64" ]; then
+            ${GITHUB_WORKSPACE}/buildroot/bin/aarch64-godot-linux-gnu-strip ./bin/godot.*
+          else
+            strip ./bin/godot.*
+          fi
           chmod +x ./bin/godot.*
           mkdir -p ${{env.OUTDIR}}
           mv bin/* ${{env.OUTDIR}}