build: detect current version from kustomize

This allows controller components to be updated when they are not
included as a Go Mod dependency, which is currently the case for the
notification-controller.

.github/workflows/update.yml

@@ -18,18 +18,15 @@ jobs:
 
           bump_version() {
             local RELEASE_VERSION=$(curl -s https://api.github.com/repos/fluxcd/$1/releases | jq -r 'sort_by(.published_at) | .[-1] | .tag_name')
-            local CURRENT_VERSION=$(go list -m all | grep "github.com/fluxcd/$1/api" | awk '{print $2}')
+            local CURRENT_VERSION=$(sed -n "s/\(.*$1\/.*?ref=\)//p;n" "manifests/bases/$1/kustomization.yaml")
 
             if [[ "${RELEASE_VERSION}" != "${CURRENT_VERSION}" ]]; then
-              # bump go mod
-              go mod edit -require="github.com/fluxcd/$1/api@${RELEASE_VERSION}"
-
               # bump kustomize
               sed -i "s/\($1\/.*?ref=\).*/\1${RELEASE_VERSION}/g" "manifests/bases/$1/kustomization.yaml"
 
-              # bump doc var
-              if [[ $2 ]]; then
-                sed -i "s/\($2:\s*.{{\s*'\)\(v[0-9.]\+\)\('\s*}}\)/\1${RELEASE_VERSION}\3/" .github/workflows/docs.yaml
+              if [[ ! -z $(go list -m all | grep "github.com/fluxcd/$1/api" | awk '{print $2}') ]]; then
+                # bump go mod
+                go mod edit -require="github.com/fluxcd/$1/api@${RELEASE_VERSION}"
               fi
 
               PR_BODY="$PR_BODY- $1 to ${RELEASE_VERSION}%0A"
@@ -38,9 +35,10 @@ jobs:
 
           {
             # bump controller versions
-            bump_version helm-controller HELM_VER
-            bump_version kustomize-controller KUSTOMIZE_VER
-            bump_version source-controller SOURCE_VER
+            bump_version helm-controller
+            bump_version kustomize-controller
+            bump_version source-controller
+            bump_version notification-controller
 
             # add missing and remove unused modules
             go mod tidy