feat: add --distro flag to manually specify OS distribution for vulnerability scanning (#8070)

Signed-off-by: knqyf263 <knqyf263@gmail.com>
Co-authored-by: DmitriyLewen <dmitriy.lewen@smartforce.io>

integration/client_server_test.go

@@ -36,6 +36,7 @@ type csArgs struct {
 	ListAllPackages   bool
 	Target            string
 	secretConfig      string
+	Distro            string
 }
 
 func TestClientServer(t *testing.T) {
@@ -52,6 +53,18 @@ func TestClientServer(t *testing.T) {
 			},
 			golden: "testdata/alpine-39.json.golden",
 		},
+		{
+			name: "alpine 3.9 as alpine 3.10",
+			args: csArgs{
+				Input:  "testdata/fixtures/images/alpine-39.tar.gz",
+				Distro: "alpine/3.10",
+			},
+			override: func(t *testing.T, want, got *types.Report) {
+				want.Metadata.OS.Name = "3.10"
+				want.Results[0].Target = "testdata/fixtures/images/alpine-39.tar.gz (alpine 3.10)"
+			},
+			golden: "testdata/alpine-39.json.golden",
+		},
 		{
 			name: "alpine 3.9 with high and critical severity",
 			args: csArgs{
@@ -684,6 +697,10 @@ func setupClient(t *testing.T, c csArgs, addr string, cacheDir string) []string
 		osArgs = append(osArgs, c.Target)
 	}
 
+	if c.Distro != "" {
+		osArgs = append(osArgs, "--distro", c.Distro)
+	}
+
 	return osArgs
 }