Add flag to set kubectl binary location

[jacobwoffenden]

Fixes #137

[jacobwoffenden]

Testing Implementation

root@e97ec0260b1f:/go/src/github.com/UKHomeOffice/kd# make
--> Installing build dependencies
make dep-install
make[1]: Entering directory '/go/src/github.com/UKHomeOffice/kd'
--> Retrieving dependencies
make[1]: Leaving directory '/go/src/github.com/UKHomeOffice/kd'
--> Compiling the project
mkdir -p bin
go build -ldflags "-X main.Version=v1.17.0-1-gff754a0" -o bin/kd ./...

root@e97ec0260b1f:/go/src/github.com/UKHomeOffice/kd# ./bin/kd --file test/deployment.yaml 
[INFO] 2020/12/15 18:22:45 main.go:645: deploying deployment/nginx-deployment
[ERROR] 2020/12/15 18:22:45 main.go:264: exec: "kubectl": executable file not found in $PATH

root@e97ec0260b1f:/go/src/github.com/UKHomeOffice/kd# curl -LO "https://storage.googleapis.com/kubernetes-release/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/linux/amd64/kubectl"
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 38.3M  100 38.3M    0     0  2992k      0  0:00:13  0:00:13 --:--:-- 2831k

root@e97ec0260b1f:/go/src/github.com/UKHomeOffice/kd# chmod +x kubectl 

root@e97ec0260b1f:/go/src/github.com/UKHomeOffice/kd# mv kubectl /tmp/kubectl

root@e97ec0260b1f:/go/src/github.com/UKHomeOffice/kd# ./bin/kd --kubectl-binary /tmp/kubectl --file test/deployment.yaml 
[INFO] 2020/12/15 18:24:42 main.go:645: deploying deployment/nginx-deployment
[ERROR] 2020/12/15 18:24:42 main.go:264: The connection to the server localhost:8080 was refused - did you specify the right host or port?

root@e97ec0260b1f:/go/src/github.com/UKHomeOffice/kd# export KUBE_BINARY=/tmp/kubectl 

root@e97ec0260b1f:/go/src/github.com/UKHomeOffice/kd# ./bin/kd --file test/deployment.yaml 
[INFO] 2020/12/15 18:25:07 main.go:645: deploying deployment/nginx-deployment
[ERROR] 2020/12/15 18:25:07 main.go:264: The connection to the server localhost:8080 was refused - did you specify the right host or port?

[KashifSaadat]

Nice 👍