Revert the change for the codegen image because the protoc-gen-js doe…

…sn't exist after alpine 3.16

Signed-off-by: Yoshiki Fujikane <ffjlabo@gmail.com>

tool/codegen/Dockerfile

@@ -1,13 +1,13 @@
 # Builder image to build go program.
-FROM golang:1.22.3-alpine3.19 as BUILDER
+FROM golang:1.20.4-alpine3.16 as BUILDER
 
 COPY protoc-gen-auth /protoc-gen-auth
 RUN cd /protoc-gen-auth \
   && go build -o /usr/local/bin/protoc-gen-auth . \
   && chmod +x /usr/local/bin/protoc-gen-auth
 
 # Codegen image which is actually being used.
-FROM golang:1.22.3-alpine3.19
+FROM golang:1.20.4-alpine3.16
 
 # This is version of protobuf installed in the image.
 # See https://pkgs.alpinelinux.org/packages?name=protobuf&branch=v3.16