Set TKN_BINARY_URL in Makefile

To make it easier to override the TKN_BINARY_URL, set it in the Makefile

Author: chmouel

Makefile

@@ -2,6 +2,7 @@ TARGET_NAMESPACE=pipelines-as-code
 GOLANGCI_LINT=golangci-lint
 GOFUMPT=gofumpt
 TKN_BINARY_NAME := tkn
+TKN_BINARY_URL := https://tekton.dev/docs/cli/\#installation
 LDFLAGS=
 OUTPUT_DIR=bin
 GO           = go
@@ -18,7 +19,7 @@ MD_FILES := $(shell find . -type f -regex ".*md"  -not -regex '^./vendor/.*'  -n
 ifeq ($(PAC_VERSION),)
 	PAC_VERSION="$(shell git describe --tags --exact-match 2>/dev/null || echo nightly-`date +'%Y%m%d'`-`git rev-parse --short HEAD`)"
 endif
-FLAGS += -ldflags "-X github.com/openshift-pipelines/pipelines-as-code/pkg/params/version.Version=$(PAC_VERSION) $(LDFLAGS) -X github.com/openshift-pipelines/pipelines-as-code/pkg/params/settings.TknBinaryName=$(TKN_BINARY_NAME)"
+FLAGS += -ldflags "-X github.com/openshift-pipelines/pipelines-as-code/pkg/params/version.Version=$(PAC_VERSION) $(LDFLAGS) -X github.com/openshift-pipelines/pipelines-as-code/pkg/params/settings.TknBinaryName=$(TKN_BINARY_NAME) -X github.com/openshift-pipelines/pipelines-as-code/pkg/params/settings.TknBinaryURL=$(TKN_BINARY_URL)"
 
 
 all: $(OUTPUT_DIR)/pipelines-as-code-controller $(OUTPUT_DIR)/tkn-pac test