CASMPET-5266: Bump go version to 1.17.6

The build doesn't work with go version 1.16.9. The build was failing
with

```
[2022-01-25T22:54:22.534Z] vendor/sigs.k8s.io/json/internal/golang/encoding/json/encode.go:1249:12: sf.IsExported undefined (type reflect.StructField has no field or method IsExported)
```

Looking at bugs like kubernetes-sigs/json#8
it says that go 1.16 is on its way out.

The latest 1.17 is 1.17.6, see
https://go.dev/doc/devel/release#go1.17.minor

Makefile

@@ -1,6 +1,6 @@
 .PHONY: clean local test linux macos docker push scm-source.json e2e
 
-GO_BINARY ?= /home/jenkins/go/bin/go1.16.9
+GO_BINARY ?= /home/jenkins/go/bin/go1.17.6
 BINARY ?= postgres-operator
 BUILD_FLAGS ?= -v
 CGO_ENABLED ?= 0

buildPrep.sh

@@ -3,7 +3,7 @@ set -e -x
 
 export PATH=$PATH:/usr/local/go/bin
 export PATH=$PATH:/root/go/bin
-rm -f go1.16.9.linux-amd64.tar*
+rm -f go1.17.6.linux-amd64.tar*
 : "${GOPATH:=$HOME/go}"
 
 if which git ; then
@@ -18,11 +18,11 @@ if which go ; then
   echo "Go is installed."
 else
   echo "Go wasn't installed, trying to install"
-  wget https://dl.google.com/go/go1.16.9.linux-amd64.tar.gz
-  tar -C /usr/local -xzf go1.16.9.linux-amd64.tar.gz
+  wget https://dl.google.com/go/go1.17.6.linux-amd64.tar.gz
+  tar -C /usr/local -xzf go1.17.6.linux-amd64.tar.gz
 fi
 
-GO_VERSION="1.16.9"
+GO_VERSION="1.17.6"
 INSTALLED_GO_VERSION=$(go version | awk '{print $3}')
 
 if [[ "go${GO_VERSION}" !=  $INSTALLED_GO_VERSION ]]; then

pkg/cluster/k8sres.go

@@ -470,7 +470,7 @@ func generateContainer(
 			Command: command,
 		}
 
-		handler := &v1.Handler{
+		handler := &v1.LifecycleHandler{
 			Exec: execAction,
 		}