Docker: Refine the main dockerfile. v6.0.54

[winlinvip]

Occasionally, developers may wish to create the most recent SRS images or make changes to the SRS code and build images for distribution purposes.

This patch simplifies the SRS image building process for developers. Instead of using the previous command:

docker build -t srs -f trunk/Dockerfile .

Use the refined version:

docker build -t srs -f Dockerfile .

# Or
docker build -t srs .

Run SRS with the local image:

docker run --rm -it srs

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Sometimes, developers may want to create the latest SRS image or modify SRS code and build an image for distribution.

Improving the Dockerfile can make it easier to compile the SRS image. The previous command was:

docker build -t srs -f trunk/Dockerfile .

This patch moves the Dockerfile to the root directory, so the command can be simpler:

docker build -t srs -f Dockerfile .

# Or
docker build -t srs .

After compiling the local image, you can run it directly.

docker run --rm -it srs

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