fix: ensure we can access git information from within Docker

docker_build.sh

@@ -1,7 +1,14 @@
 #!/bin/sh
 set -ex
+
 echo "Building the docker image"
 docker build -t wasi-sdk-builder:latest .
+
+if ! git config safe.directory | grep --quiet /workspace; then
+    echo "Setting up Git safe directory"
+    git config --global --add safe.directory /workspace
+fi
+
 echo "Building the package in docker image"
 mkdir -p ~/.ccache
 docker run --rm -v "$PWD":/workspace -v ~/.ccache:/root/.ccache -e NINJA_FLAGS=-v --workdir /workspace --tmpfs /tmp:exec wasi-sdk-builder:latest make package LLVM_CMAKE_FLAGS=-DLLVM_CCACHE_BUILD=ON