feat: Python,Go func listen dual-stack (knative#2898)

* feat: py func listen dual-stack

Signed-off-by: Matej Vašek <[email protected]>

* fix: Go host built image listens on any iface

Previously it was listening only on localhost

Signed-off-by: Matej Vašek <[email protected]>

---------

Signed-off-by: Matej Vašek <[email protected]>

Author: matejvasek

pkg/builders/s2i/builder.go

@@ -179,7 +179,7 @@ func (b *Builder) Build(ctx context.Context, f fn.Function, platforms []fn.Platf
 		return err
 	}
 
-	buildEnvs["LISTEN_ADDRESS"] = "0.0.0.0:8080"
+	buildEnvs["LISTEN_ADDRESS"] = "[::]:8080"
 	for k, v := range buildEnvs {
 		cfg.Environment = append(cfg.Environment, api.EnvironmentSpec{Name: k, Value: v})
 	}

pkg/oci/go_builder.go

@@ -25,6 +25,7 @@ func (b goBuilder) Base() string {
 func (b goBuilder) Configure(_ buildJob, _ v1.Platform, cf v1.ConfigFile) (v1.ConfigFile, error) {
 	// : Using Cmd rather than Entrypoint due to it being overrideable.
 	cf.Config.Cmd = []string{"/func/f"}
+	cf.Config.Env = append(cf.Config.Env, "LISTEN_ADDRESS=[::]:8080")
 	return cf, nil
 }
 

pkg/oci/python_builder.go

@@ -31,7 +31,7 @@ func (b pythonBuilder) Configure(job buildJob, _ v1.Platform, cf v1.ConfigFile)
 		svcPath       = filepath.Join("/func", svcRelPath)              // eg /func/.func/builds/by-hash/$HASH
 		pythonPathEnv = fmt.Sprintf("PYTHONPATH=%v/lib", svcPath)
 		mainPath      = fmt.Sprintf("%v/service/main.py", svcPath)
-		listenAddrEnv = "LISTEN_ADDRESS=0.0.0.0:8080"
+		listenAddrEnv = "LISTEN_ADDRESS=[::]:8080"
 	)
 
 	cf.Config.Env = append(cf.Config.Env, pythonPathEnv, listenAddrEnv)