diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
new file mode 100644
index 000000000..7a4de1e46
--- /dev/null
+++ b/.github/workflows/main.yml
@@ -0,0 +1,48 @@
+---
+name: CI
+
+'on':
+  - push
+  - pull_request
+
+env:
+  GOPROXY: https://proxy.golang.org
+  GOPATH: ${{ github.workspace }}/go
+
+permissions:
+  contents: read
+
+jobs:
+  build-linux-amd64:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up go
+        uses: actions/setup-go@v4
+        with:
+          go-version: '1.20.6'
+
+      - uses: actions/checkout@v3
+        with:
+          path: git-sync
+
+      - name: make all-build
+        working-directory: git-sync
+        run: |
+          make all-build
+
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up go
+        uses: actions/setup-go@v4
+        with:
+          go-version: '1.20.6'
+
+      - uses: actions/checkout@v3
+        with:
+          path: git-sync
+
+      - name: make test
+        working-directory: git-sync
+        run: |
+          make test
diff --git a/test_e2e.sh b/test_e2e.sh
index 1e18bfe55..e9d288f8d 100755
--- a/test_e2e.sh
+++ b/test_e2e.sh
@@ -185,6 +185,17 @@ function clean_work() {
     mkdir -p "$WORK"
 }
 
+# config_repo sets required git config, so we don't depend on (shared) global git config.
+#
+# Args:
+#  $1: directory of git repo
+function config_repo() {
+    local repo=$1
+
+    git -C "$repo" config user.email "git-sync-test@example.com"
+    git -C "$repo" config user.name "git-sync-test"
+}
+
 # REPO and REPO2 are the source repos under test.
 REPO="$DIR/repo"
 REPO2="${REPO}2"
@@ -193,6 +204,7 @@ function init_repo() {
     rm -rf "$REPO"
     mkdir -p "$REPO"
     git -C "$REPO" init -q -b "$MAIN_BRANCH"
+    config_repo "$REPO"
     touch "$REPO/file"
     git -C "$REPO" add file
     git -C "$REPO" commit -aqm "init file"
@@ -374,6 +386,7 @@ function e2e::init_root_is_under_another_repo() {
     mkdir -p "$ROOT/subdir/root"
     date > "$ROOT/subdir/root/file" # so it is not empty
     git -C "$ROOT/subdir" init -q
+    config_repo "$ROOT/subdir"
 
     GIT_SYNC \
         --one-time \
@@ -395,6 +408,7 @@ function e2e::init_root_fails_sanity() {
 
     # Make an invalid git repo.
     git -C "$ROOT" init -q
+    config_repo "$ROOT"
     echo "ref: refs/heads/nonexist" > "$ROOT/.git/HEAD"
 
     GIT_SYNC \
@@ -2380,6 +2394,7 @@ function e2e::submodule_sync_default() {
     mkdir "$SUBMODULE"
 
     git -C "$SUBMODULE" init -q -b "$MAIN_BRANCH"
+    config_repo "$SUBMODULE"
     echo "submodule" > "$SUBMODULE/submodule"
     git -C "$SUBMODULE" add submodule
     git -C "$SUBMODULE" commit -aqm "init submodule file"
@@ -2390,6 +2405,7 @@ function e2e::submodule_sync_default() {
     mkdir "$NESTED_SUBMODULE"
 
     git -C "$NESTED_SUBMODULE" init -q -b "$MAIN_BRANCH"
+    config_repo "$NESTED_SUBMODULE"
     echo "nested-submodule" > "$NESTED_SUBMODULE/nested-submodule"
     git -C "$NESTED_SUBMODULE" add nested-submodule
     git -C "$NESTED_SUBMODULE" commit -aqm "init nested-submodule file"
@@ -2486,6 +2502,7 @@ function e2e::submodule_sync_depth() {
     mkdir "$SUBMODULE"
 
     git -C "$SUBMODULE" init -q -b "$MAIN_BRANCH"
+    config_repo "$SUBMODULE"
 
     # First sync
     expected_depth="1"
@@ -2566,6 +2583,7 @@ function e2e::submodule_sync_off() {
     mkdir "$SUBMODULE"
 
     git -C "$SUBMODULE" init -q -b "$MAIN_BRANCH"
+    config_repo "$SUBMODULE"
     echo "submodule" > "$SUBMODULE/submodule"
     git -C "$SUBMODULE" add submodule
     git -C "$SUBMODULE" commit -aqm "init submodule file"
@@ -2596,6 +2614,7 @@ function e2e::submodule_sync_shallow() {
     mkdir "$SUBMODULE"
 
     git -C "$SUBMODULE" init -q -b "$MAIN_BRANCH"
+    config_repo "$SUBMODULE"
     echo "submodule" > "$SUBMODULE/submodule"
     git -C "$SUBMODULE" add submodule
     git -C "$SUBMODULE" commit -aqm "init submodule file"
@@ -2606,6 +2625,7 @@ function e2e::submodule_sync_shallow() {
     mkdir "$NESTED_SUBMODULE"
 
     git -C "$NESTED_SUBMODULE" init -q -b "$MAIN_BRANCH"
+    config_repo "$NESTED_SUBMODULE"
     echo "nested-submodule" > "$NESTED_SUBMODULE/nested-submodule"
     git -C "$NESTED_SUBMODULE" add nested-submodule
     git -C "$NESTED_SUBMODULE" commit -aqm "init nested-submodule file"
@@ -2642,6 +2662,7 @@ function e2e::submodule_sync_relative() {
     mkdir "$SUBMODULE"
 
     git -C "$SUBMODULE" init -q -b "$MAIN_BRANCH"
+    config_repo "$SUBMODULE"
     echo "submodule" > "$SUBMODULE/submodule"
     git -C "$SUBMODULE" add submodule
     git -C "$SUBMODULE" commit -aqm "init submodule file"