Add -p and --workspace flags for contract workspaces

[ltfschoen]

Relates to:

• Issue Mimic cargo adding -p flag to build sub contracts, and all with --all #182
  Continuation of:
• PR Add --package and --all flags for contract workspaces #647

Usage

• Clone this branch

mkdir -p ~/code/cargo-contract/
cd ~/code/cargo-contract/
git clone https://github.com/ltfschoen/cargo-contract
cd cargo-contract/
git fetch origin bar-new-flags:bar-new-flags
git checkout bar-new-flags

• Create a separate empty folder elsewhere.

mkdir -p ~/code/preview/

• Download the flipper/ and delegator/ folder examples into that directory from https://github.com/paritytech/ink-examples/tree/main. So you should have ~/code/preview/flipper and ~/code/preview/delegator
• Build cargo-contract source

cd ~/code/cargo-contract/
cargo build

• Copy across the binary into the Delegator Example workspace

cp ~/code/cargo-contract//target/debug/cargo-contract ~/preview/delegator

• Build Delegator Example with the built binary. It may be necessary to install some dependencies and set some environment variables as shown below on macOS.

cd ~/preview/delegator
cargo install cargo-dylint dylint-link
echo 'export PATH="$PATH:$HOME/.cargo/bin"' >> "${HOME}/.bashrc"
source "${HOME}/.bashrc"
export RUSTUP_TOOLCHAIN=stable
./cargo-contract contract build --workspace

Progress: Currently running the above outputs the below clang: error: no input files. I tried this on macOS and thought it was due to old developer tools, but I also tried using a Docker container with Debian 11 and got similar error, and also used a cloud service with fresh Ubuntu and same error.

 Building contract: accumulator [1/4]
 [1/6] Checking ink! linting rules
Detected cargo-dylint binary...

Detected dylint-link binary...

Usage: cargo-dylint <COMMAND>

Commands:
  dylint  
  help    Print this message or the help of the given subcommand(s)

Options:
  -h, --help  Print help
clang: error: no input files
Error: command failed: "cc"

[cmichi]

I'm closing the PR due to staleness and the cargo-contract master having moved on significantly since the PR was created. Feel free to reopen based on the latest master in case you're interested in continuing work on it!