Docker base images for CI pipelines

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Provides Docker base images for CI pipelines

Multiple images in various combinations can be built. They can be generalized into three types:

1. Rust - Includes the default GCC and MinGW toolchains for Ubuntu and Debian, along with Rust cross-compilation targets
2. OpenJDK - installed from https://adoptium.net/ and Maven for Ubuntu and Debian Linux
3. Combined - Contains both Rust and OpenJDK toolchains in a single image

Below are examples of how to build different image combinations:

# --- Combined builds ---
- base-image: debian:buster
  flavor: rust-1.51.0
  combine: "rust-1.51.0;jdk-8,jdk-11,jdk-17"

- base-image: debian:buster
  flavor: rust-stable
  combine: "rust-stable;jdk-8,jdk-11,jdk-17"

- base-image: debian:buster
  flavor: rust-nightly
  combine: "rust-nightly;jdk-8,jdk-11,jdk-17"

- base-image: debian:buster
  flavor: rust-nightly-2021-04-25
  combine: "rust-nightly-2021-04-25;jdk-8,jdk-11,jdk-17"

For more details and available tags, see the Docker Hub repository: horizenlabs/ci-base