Autobump Collector VERSION to latest on build - (#1401)

* Auto increment version

* fix(makefile): update versioning mechanism for OpenTelemetry Collector

* fix(makefile): update versioning mechanism for OpenTelemetry Collector

Replace the mechanism to fetch VERSION from remote versions.yaml with OTELCOL_VERSION placeholder.
Add a new target set-otelcol-version to set the OpenTelemetry Collector version from go.mod.
Modify the build target to depend on set-otelcol-version.
Remove the update-collector-version target and its usage in the build target.

* chore: remove VERSION file and update gitignore

modified:   .gitignore
deleted:    collector/VERSION

.gitignore

@@ -18,3 +18,5 @@ __pycache__/*
 build.toml
 
 *.zip
+
+collector/VERSION

collector/Makefile

@@ -4,14 +4,13 @@ BASE_SPACE:=$(shell pwd)
 BUILD_SPACE:=$(BASE_SPACE)/build
 BUCKET_NAME:=lambda-artifacts-$(shell dd if=/dev/random bs=8 count=1 2>/dev/null | od -An -tx1 | tr -d ' \t\n')
 LAYER_NAME:=otel-collector
-
-VERSION=$(shell cat VERSION)
+OTELCOL_VERSION="UNSET" # run recipe set-otelcol-version to get this
 GIT_SHA=$(shell git rev-parse HEAD)
 GOARCH ?= amd64
 GOBUILD=GO111MODULE=on CGO_ENABLED=0 installsuffix=cgo go build -trimpath
 BUILD_INFO_IMPORT_PATH=main
 
-LDFLAGS=-ldflags "-s -w -X $(BUILD_INFO_IMPORT_PATH).GitHash=$(GIT_SHA) -X $(BUILD_INFO_IMPORT_PATH).Version=$(VERSION) \
+LDFLAGS=-ldflags "-s -w -X $(BUILD_INFO_IMPORT_PATH).GitHash=$(GIT_SHA) -X $(BUILD_INFO_IMPORT_PATH).Version=$(OTELCOL_VERSION) \
 -X github.com/open-telemetry/opentelemetry-collector-contrib/exporter/awsxrayexporter.collectorDistribution=opentelemetry-collector-lambda"
 
 TOOLS_MOD_DIR := ./internal/tools
@@ -34,7 +33,7 @@ clean:
 	rm -rf build/
 
 .PHONY: build
-build: clean
+build: clean set-otelcol-version
 	@echo Building otel collector extension
 	mkdir -p $(BUILD_SPACE)/extensions
 	GOOS=linux GOARCH=$(GOARCH) $(GOBUILD) $(LDFLAGS) -o $(BUILD_SPACE)/extensions .
@@ -56,6 +55,11 @@ publish-layer: package
 	aws lambda publish-layer-version --layer-name $(LAYER_NAME) --zip-file fileb://$(BUILD_SPACE)/opentelemetry-collector-layer-$(GOARCH).zip --compatible-runtimes nodejs14.x nodejs16.x nodejs18.x java11 python3.8 python3.9 python3.10 python3.11 --query 'LayerVersionArn' --output text
 	@echo OpenTelemetry Collector layer published.
 
+.PHONY: set-otelcol-version
+set-otelcol-version:
+	@OTELCOL_VERSION=$$(grep "go.opentelemetry.io/collector/otelcol v" go.mod | awk '{print $$2; exit}'); \
+	echo $$OTELCOL_VERSION > VERSION; \
+
 .PHONY: gotidy
 gotidy:
 	@$(MAKE) for-all-target TARGET="tidy"