Bump github.com/containers/buildah from 1.16.1 to 1.16.2

Bumps [github.com/containers/buildah](https://github.com/containers/buildah) from 1.16.1 to 1.16.2.
- [Release notes](https://github.com/containers/buildah/releases)
- [Changelog](https://github.com/containers/buildah/blob/master/CHANGELOG.md)
- [Commits](https://github.com/containers/buildah/compare/v1.16.1...v1.16.2)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

vendor/github.com/containers/buildah/CHANGELOG.md

@@ -2,6 +2,9 @@
 
 # Changelog
 
+## v1.16.2 (2020-09-21)
+    Add(): fix handling of relative paths with no ContextDir
+
 ## v1.16.1 (2020-09-10)
     copier.Get(): hard link targets shouldn't be relative paths
 

vendor/github.com/containers/buildah/add.go

@@ -151,18 +151,26 @@ func (b *Builder) Add(destination string, extract bool, options AddAndCopyOption
 	}()
 
 	contextDir := options.ContextDir
-	if contextDir == "" {
+	currentDir := options.ContextDir
+	if options.ContextDir == "" {
 		contextDir = string(os.PathSeparator)
+		currentDir, err = os.Getwd()
+		if err != nil {
+			return errors.Wrapf(err, "error determining current working directory")
+		}
 	}
 
 	// Figure out what sorts of sources we have.
 	var localSources, remoteSources []string
-	for _, src := range sources {
+	for i, src := range sources {
 		if sourceIsRemote(src) {
 			remoteSources = append(remoteSources, src)
 			continue
 		}
-		localSources = append(localSources, src)
+		if !filepath.IsAbs(src) && options.ContextDir == "" {
+			sources[i] = filepath.Join(currentDir, src)
+		}
+		localSources = append(localSources, sources[i])
 	}
 
 	// Check how many items our local source specs matched.  Each spec

vendor/github.com/containers/buildah/buildah.go

@@ -28,7 +28,7 @@ const (
 	Package = "buildah"
 	// Version for the Package.  Bump version in contrib/rpm/buildah.spec
 	// too.
-	Version = "1.16.1"
+	Version = "1.16.2"
 	// The value we use to identify what type of information, currently a
 	// serialized Builder structure, we are using as per-container state.
 	// This should only be changed when we make incompatible changes to

vendor/github.com/containers/buildah/changelog.txt

@@ -1,3 +1,5 @@
+- Changelog for v1.16.2 (2020-09-21)
+  * Add(): fix handling of relative paths with no ContextDir
 
 - Changelog for v1.16.1 (2020-09-10)
   * copier.Get(): hard link targets shouldn't be relative paths