some fixes for docker and migrations

service_a/go.mod

@@ -3,6 +3,7 @@ module servicea
 go 1.25.2
 
 require (
+	github.com/golang-migrate/migrate/v4 v4.19.0
 	github.com/jackc/pgx/v5 v5.7.6
 	github.com/stretchr/testify v1.11.1
 	pkg v0.0.0-00010101000000-000000000000
@@ -10,10 +11,13 @@ require (
 
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/hashicorp/errwrap v1.1.0 // indirect
+	github.com/hashicorp/go-multierror v1.1.1 // indirect
 	github.com/jackc/pgpassfile v1.0.0 // indirect
 	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
 	github.com/jackc/puddle/v2 v2.2.2 // indirect
 	github.com/kr/text v0.2.0 // indirect
+	github.com/lib/pq v1.10.9 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/rogpeppe/go-internal v1.14.1 // indirect
 	golang.org/x/crypto v0.37.0 // indirect