fix: prevent local absolute paths from being treated as remote URLs (#2397)

Add filepath.IsAbs guard to IsRemote and Parse to prevent Windows drive
letter paths (e.g., C:\path) from being misinterpreted as remote URLs
by go-getter's url.Parse, which prepends file:// to drive letter paths.

Fixes #2384

Signed-off-by: Aditya Menon <amenon@canarytechnologies.com>

pkg/remote/remote_windows_test.go

@@ -0,0 +1,69 @@
+//go:build windows
+
+package remote
+
+import (
+	"testing"
+)
+
+func TestIsRemote_Windows(t *testing.T) {
+	testcases := []struct {
+		name     string
+		input    string
+		expected bool
+	}{
+		{
+			name:     "windows drive letter path",
+			input:    `C:\project\services\values.yaml`,
+			expected: false,
+		},
+		{
+			name:     "windows UNC path",
+			input:    `\\server\share\path\values.yaml`,
+			expected: false,
+		},
+	}
+
+	for _, tt := range testcases {
+		t.Run(tt.name, func(t *testing.T) {
+			result := IsRemote(tt.input)
+			if result != tt.expected {
+				t.Errorf("IsRemote(%q) = %v, want %v", tt.input, result, tt.expected)
+			}
+		})
+	}
+}
+
+func TestParse_Windows(t *testing.T) {
+	testcases := []struct {
+		name  string
+		input string
+		err   string
+	}{
+		{
+			name:  "windows drive letter path",
+			input: `C:\project\services\values.yaml`,
+			err:   `parse url: local absolute path is not a remote URL: C:\project\services\values.yaml`,
+		},
+		{
+			name:  "windows UNC path",
+			input: `\\server\share\path\values.yaml`,
+			err:   `parse url: local absolute path is not a remote URL: \\server\share\path\values.yaml`,
+		},
+	}
+
+	for _, tt := range testcases {
+		t.Run(tt.name, func(t *testing.T) {
+			_, err := Parse(tt.input)
+			if err == nil {
+				t.Fatalf("Parse(%q) expected error, got nil", tt.input)
+			}
+			if _, ok := err.(InvalidURLError); !ok {
+				t.Fatalf("Parse(%q) expected InvalidURLError, got %T: %v", tt.input, err, err)
+			}
+			if err.Error() != tt.err {
+				t.Errorf("Parse(%q) error = %q, want %q", tt.input, err.Error(), tt.err)
+			}
+		})
+	}
+}