feat: bump to use go1.22

Signed-off-by: Rui Chen <rui@chenrui.dev>

.go-version

@@ -1 +1 @@
-1.21
+1.22

Dockerfile

@@ -4,7 +4,7 @@ ARG OPENTOFU_VERSION=latest
 FROM hashicorp/terraform:$TERRAFORM_VERSION AS terraform
 FROM ghcr.io/opentofu/opentofu:$OPENTOFU_VERSION AS opentofu
 
-FROM golang:1.21-alpine3.18
+FROM golang:1.22-alpine3.19
 RUN apk --no-cache add make git bash
 COPY --from=terraform /bin/terraform /usr/local/bin/
 COPY --from=opentofu /usr/local/bin/tofu /usr/local/bin/

README.md

@@ -285,7 +285,7 @@ https://github.com/minamijoyo/tfmigrate/releases
 
 ### Source
 
-If you have Go 1.21+ development environment:
+If you have Go 1.22+ development environment:
 
 ```
 $ git clone https://github.com/minamijoyo/tfmigrate

go.mod

@@ -1,6 +1,6 @@
 module github.com/minamijoyo/tfmigrate
 
-go 1.21
+go 1.22
 
 require (
 	cloud.google.com/go/storage v1.25.0