bake(compose): allow dot in target name

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

bake/bake.go

@@ -90,6 +90,10 @@ func ReadTargets(ctx context.Context, files []File, targets, overrides []string,
 		return nil, nil, err
 	}
 
+	for i, t := range targets {
+		targets[i] = sanitizeTargetName(t)
+	}
+
 	o, err := c.newOverrides(overrides)
 	if err != nil {
 		return nil, nil, err
@@ -976,6 +980,13 @@ func validateTargetName(name string) error {
 	return nil
 }
 
+func sanitizeTargetName(target string) string {
+	// as stipulated in compose spec, service name can contain a dot so as
+	// best-effort and to avoid any potential ambiguity, we replace the dot
+	// with an underscore.
+	return strings.ReplaceAll(target, ".", "_")
+}
+
 func sliceEqual(s1, s2 []string) bool {
 	if len(s1) != len(s2) {
 		return false