docs: update docs with new docker specific instructions (#1941)

* docs: update docs with new docker specific instructions
---------

Signed-off-by: Christopher Phillips <christopher.phillips@anchore.com>
Former-commit-id: c67c76e84df84e3e24aa307637d884ca8b7e3eea

DEVELOPING.md

@@ -7,6 +7,25 @@ In order to test and develop in this repo you will need the following dependenci
 - docker
 - make
 
+### Docker settings for getting started
+Make sure you've updated your docker settings so the default docker socket path is available.
+
+Go to:
+
+docker -> settings -> advanced
+
+Make sure:
+
+```
+Allow the default Docker socket to be used
+```
+
+is checked.
+
+Also double check that the docker context being used is the default context. If it is not, run:
+
+`docker context use default`
+
 After cloning the following step can help you get setup:
 1. run `make bootstrap` to download go mod dependencies, create the `/.tmp` dir, and download helper utilities.
 2. run `make` to view the selection of developer commands in the Makefile

Makefile

@@ -313,7 +313,8 @@ generate-license-list:  ## Generate an updated spdx license list
 ## Build-related targets #################################
 
 .PHONY: build
-build: $(SNAPSHOT_DIR)  ## Build release snapshot binaries and packages
+build:
+	CGO_ENABLED=0 go build -trimpath -ldflags "$(LDFLAGS)" -o $@ ./cmd/syft
 
 $(SNAPSHOT_DIR):  ## Build snapshot release binaries and packages
 	$(call title,Building snapshot artifacts)

build.REMOVED.git-id

@@ -0,0 +1 @@
+ab24f7f8cbf320cf498fcf0ca9b926ed93d4475a