Update README and weed/Makefile (#7571)

* Add link to wiki installation page in README

* Add building for docker in weed/Makefile

Building without `CGO_ENABLED=0` and using the executable in docker can result in a docker container exiting with an error

* Update README.md

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

* Add GOOS=linux to build_docker target for cross-compilation

---------

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
Co-authored-by: Chris Lu <chris.lu@gmail.com>

README.md

@@ -520,6 +520,8 @@ cd seaweedfs/weed && make install
 
 Once this is done, you will find the executable "weed" in your `$GOPATH/bin` directory
 
+For more installation options, including how to run with Docker, see the [Getting Started guide](https://github.com/seaweedfs/seaweedfs/wiki/Getting-Started).
+
 [Back to TOC](#table-of-contents)
 
 ## Disk Related Topics ##

weed/Makefile

@@ -9,6 +9,9 @@ all: install
 install:
 	go install -ldflags="-s -w"
 
+build_docker:
+	CGO_ENABLED=0 GOOS=linux go build -ldflags="-s -w"
+
 clean:
 	go clean $(SOURCE_DIR)
 	rm -f $(BINARY)