schema: use Go's embed package instead of esc

Signed-off-by: Stephen Day <stephen.day@getcruise.com>

Makefile

@@ -49,7 +49,6 @@ help:
 	@echo " * 'docs' - produce document in the $(OUTPUT_DIRNAME) directory"
 	@echo " * 'fmt' - format the json with indentation"
 	@echo " * 'validate-examples' - validate the examples in the specification markdown files"
-	@echo " * 'schema-fs' - regenerate the virtual schema http/FileSystem"
 	@echo " * 'check-license' - check license headers in source files"
 	@echo " * 'lint' - Execute the source code linter"
 	@echo " * 'test' - Execute the unit tests"
@@ -79,15 +78,9 @@ endif
 header.html: .tool/genheader.go specs-go/version.go
 	go run .tool/genheader.go > $@
 
-validate-examples: schema/fs.go
+validate-examples: schema/schema.go
 	go test -run TestValidate ./schema
 
-schema/fs.go: $(wildcard schema/*.json) schema/gen.go
-	cd schema && printf "%s\n\n%s\n" "$$(cat ../.header)" "$$(go generate)" > fs.go
-
-schema-fs: schema/fs.go
-	@echo "generating schema fs"
-
 check-license:
 	@echo "checking license headers"
 	@./.tool/check-license
@@ -117,9 +110,6 @@ install.tools: $(TOOLS:%=.install.%)
 .install.lint:
 	go get github.com/golangci/golangci-lint/cmd/golangci-lint@latest
 
-.install.esc:
-	go get -u github.com/mjibson/esc
-
 .install.gitvalidation:
 	go get -u github.com/vbatts/git-validation
 

go.mod

@@ -1,18 +1,14 @@
 module github.com/opencontainers/image-spec
 
-go 1.11
+go 1.16
 
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/golangci/golangci-lint v1.43.0 // indirect
-	github.com/kr/text v0.2.0 // indirect
-	github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e // indirect
 	github.com/opencontainers/go-digest v1.0.0
 	github.com/pkg/errors v0.9.1
 	github.com/russross/blackfriday v1.6.0
 	github.com/stretchr/testify v1.7.0 // indirect
 	github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415
 	github.com/xeipuuv/gojsonschema v1.2.0
-	gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f // indirect
 	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect
 )