[telemetrygen] add makefile targets (open-telemetry#18871)

Adds makefile targets for telemetrygen

Link to tracking Issue:
Fixes open-telemetry#18835

.chloggen/add-makefile-telemetrygen.yaml

@@ -0,0 +1,16 @@
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: telemetrygen
+
+# A brief description of the change. Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Add makefile targets and docker build for telemetrygen
+
+# One or more tracking issues related to the change
+issues: [18835]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:

Makefile

@@ -220,6 +220,10 @@ endif
 docker-otelcontribcol:
  COMPONENT=otelcontribcol $(MAKE) docker-component
 
+.PHONY: docker-telemetrygen
+docker-telemetrygen:
+ COMPONENT=telemetrygen $(MAKE) docker-component
+
 .PHONY: generate
 generate:
  cd cmd/mdatagen && $(GOCMD) install .
@@ -270,6 +274,12 @@ oteltestbedcol:
  cd ./cmd/oteltestbedcol && GO111MODULE=on CGO_ENABLED=0 $(GOCMD) build -trimpath -o ../../bin/oteltestbedcol_$(GOOS)_$(GOARCH)$(EXTENSION) \
  $(BUILD_INFO) -tags $(GO_BUILD_TAGS) .
 
+# Build the telemetrygen executable.
+.PHONY: telemetrygen
+telemetrygen:
+ cd ./cmd/telemetrygen && GO111MODULE=on CGO_ENABLED=0 $(GOCMD) build -trimpath -o ../../bin/telemetrygen_$(GOOS)_$(GOARCH)$(EXTENSION) \
+ $(BUILD_INFO) -tags $(GO_BUILD_TAGS) .
+
 .PHONY: update-dep
 update-dep:
  $(MAKE) $(FOR_GROUP_TARGET) TARGET="updatedep"