fix: config merge

closes #750

Signed-off-by: Carlos Alexandro Becker <caarlos0@users.noreply.github.com>

nfpm.go

@@ -123,7 +123,7 @@ type Config struct {
 func (c *Config) Get(format string) (info *Info, err error) {
 	info = &Info{}
 	// make a deep copy of info
-	if err = mergo.Merge(info, c.Info); err != nil {
+	if err = mergo.Merge(info, c.Info, mergo.WithOverride); err != nil {
 		return nil, fmt.Errorf("failed to merge config into info: %w", err)
 	}
 	override, ok := c.Overrides[format]

nfpm_test.go

@@ -575,6 +575,7 @@ func TestOverrides(t *testing.T) {
 				}
 			}
 			require.Equal(t, "amd64", pkg.Arch)
+			require.Equal(t, time.Date(2023, 0o1, 0o2, 0, 0, 0, 0, time.UTC), pkg.MTime)
 		})
 	}
 

testdata/overrides.yaml

@@ -1,23 +1,24 @@
 # Configuration file used to unit test overrides
 name: "foo"
 arch: "amd64"
+mtime: 2023-01-02
 version: "v1.2.3"
 contents:
-- src: ./testdata/whatever.conf
-  dst: /etc/foo/whatever.conf
-  type: config
-- src: ./testdata/whatever.conf
-  dst: /deb/path.conf
-  type: config
-  packager: deb
-- src: ./testdata/whatever.conf
-  dst: /rpm/path.conf
-  type: config
-  packager: rpm
-- src: ./testdata/whatever.conf
-  dst: /apk/path.conf
-  type: config
-  packager: apk
+  - src: ./testdata/whatever.conf
+    dst: /etc/foo/whatever.conf
+    type: config
+  - src: ./testdata/whatever.conf
+    dst: /deb/path.conf
+    type: config
+    packager: deb
+  - src: ./testdata/whatever.conf
+    dst: /rpm/path.conf
+    type: config
+    packager: rpm
+  - src: ./testdata/whatever.conf
+    dst: /apk/path.conf
+    type: config
+    packager: apk
 rpm:
   group: foo
 overrides: