build: Fix wrong windows bundle tar files path separator (#5478)

Fix #5473.
 
Signed-off-by: shm12 <shm.bia@gmail.com>

build/binary-smoke-test.sh

@@ -3,13 +3,31 @@ set -eo pipefail
 OPA_EXEC="$1"
 TARGET="$2"
 
-opa() {
+github_actions_group() {
     local args="$*"
     echo "::group::$args"
-    $OPA_EXEC $args
+    $args
     echo "::endgroup::"
 }
 
+opa() {
+    local args="$*"
+    github_actions_group $OPA_EXEC $args
+}
+
+# assert_contains checks if the actual string contains the expected string.
+assert_contains() {
+    local expected="$1"
+    local actual="$2"
+    if [[ "$actual" != *"$expected"* ]]; then
+        echo "Expected '$expected' but got '$actual'"
+        exit 1
+    fi
+}
+
+
+
+
 opa version
 opa eval -t $TARGET 'time.now_ns()'
 opa eval --format pretty --bundle test/cli/smoke/golden-bundle.tar.gz --input test/cli/smoke/input.json data.test.result --fail
@@ -20,3 +38,7 @@ opa build --optimize 1 --output o1.tar.gz test/cli/smoke/data.yaml test/cli/smok
 echo '{"yay": "bar"}' | opa eval --format pretty --bundle o1.tar.gz -I data.test.result --fail
 opa build --optimize 2 --output o2.tar.gz  test/cli/smoke/data.yaml test/cli/smoke/test.rego
 echo '{"yay": "bar"}' | opa eval --format pretty --bundle o2.tar.gz -I data.test.result --fail
+
+# Tar paths 
+opa build --output o3.tar.gz test/cli/smoke
+github_actions_group assert_contains '/test/cli/smoke/test.rego' "$(tar -tf o3.tar.gz /test/cli/smoke/test.rego)"

compile/compile.go

@@ -12,6 +12,7 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"path/filepath"
 	"regexp"
 	"sort"
 	"strings"
@@ -453,9 +454,10 @@ func (c *Compiler) initBundle() error {
 	sort.Strings(modules)
 
 	for _, module := range modules {
+		path := filepath.ToSlash(load.Files.Modules[module].Name)
 		result.Modules = append(result.Modules, bundle.ModuleFile{
-			URL:    load.Files.Modules[module].Name,
-			Path:   load.Files.Modules[module].Name,
+			URL:    path,
+			Path:   path,
 			Parsed: load.Files.Modules[module].Parsed,
 			Raw:    load.Files.Modules[module].Raw,
 		})