Update cheatsheets

docker-build

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# docker build
+
+> Build an image from a Dockerfile.
+> More information: <https://docs.docker.com/engine/reference/commandline/build/>.
+
+- Build a docker image using the Dockerfile in the current directory:
+
+`docker build .`
+
+- Build a docker image from a Dockerfile at a specified URL:
+
+`docker build {{github.com/creack/docker-firefox}}`
+
+- Build a docker image and tag it:
+
+`docker build --tag {{name:tag}} .`
+
+- Build a docker image with no build context:
+
+`docker build --tag {{name:tag}} - < {{Dockerfile}}`
+
+- Do not use the cache when building the image:
+
+`docker build --no-cache --tag {{name:tag}} .`
+
+- Build a docker image using a specific Dockerfile:
+
+`docker build --file {{Dockerfile}} .`
+
+- Build with custom build-time variables:
+
+`docker build --build-arg {{HTTP_PROXY=http://10.20.30.2:1234}} --build-arg {{FTP_PROXY=http://40.50.60.5:4567}} .`