Bump golang to 1.19 and min allowed version to 1.18

Author: adriananeci

.github/workflows/ci.yaml

@@ -20,10 +20,10 @@ jobs:
     - name: Check out code
       uses: actions/checkout@v2
 
-    - name: Set up Go 1.18
+    - name: Set up Go 1.19
       uses: actions/setup-go@v2
       with:
-        go-version: 1.18.x
+        go-version: 1.19.x
       id: go
 
     - name: Get dependencies

Dockerfile

@@ -5,7 +5,7 @@ ARG RUNTIME_IMAGE=alpine:3.16
 #  cache sharing of the go mod download step.
 # Go cross compilation is also faster than emulation the go compilation across
 #  multiple platforms.
-FROM --platform=${BUILDPLATFORM} golang:1.18-buster AS builder
+FROM --platform=${BUILDPLATFORM} golang:1.19-buster AS builder
 
 # Copy sources
 WORKDIR $GOPATH/src/github.com/oauth2-proxy/oauth2-proxy

Makefile

@@ -10,7 +10,7 @@ REGISTRY ?= quay.io/oauth2-proxy
 GO_MAJOR_VERSION = $(shell $(GO) version | cut -c 14- | cut -d' ' -f1 | cut -d'.' -f1)
 GO_MINOR_VERSION = $(shell $(GO) version | cut -c 14- | cut -d' ' -f1 | cut -d'.' -f2)
 MINIMUM_SUPPORTED_GO_MAJOR_VERSION = 1
-MINIMUM_SUPPORTED_GO_MINOR_VERSION = 15
+MINIMUM_SUPPORTED_GO_MINOR_VERSION = 18
 GO_VERSION_VALIDATION_ERR_MSG = Golang version is not supported, please update to at least $(MINIMUM_SUPPORTED_GO_MAJOR_VERSION).$(MINIMUM_SUPPORTED_GO_MINOR_VERSION)
 
 ifeq ($(COVER),true)