Resolve "error: '/usr/bin/ld: cannot find -lconfig.'"

Closes #22

See merge request !15

Fixes #22

Resolve "Add `systemd` service files for Cargo"

Closes #20

See merge request !14

Directories `CMAKE_INSTALL_BINDIR` and `CMAKE_INSTALL_DATADIR` are now
exported as package variables `CARGO_BIN_INSTALL_DIR` and
`CARGO_DATA_INSTALL_DIR`. This allows consuming projects to retrieve
these values by using `find_package(cargo)`.

Resolve "Add a CLI tool for requesting data transfers."

This MR adds the `ccp` tool to Cargo so that data transfers can be started
from the command line. The tool supports the following arguments:

```console
$ ccp -h
Cargo parallel copy tool
Usage: ccp [OPTIONS]

Options:
  -h,--help                   Print this help message and exit
  -s,--server ADDRESS         Address of the Cargo server (can also be
                              provided via the CCP_SERVER environment
                              variable).
  -i,--input SRC...           Input dataset(s)
  -o,--output DST...          Output dataset(s)
  --if FLAGS                  Flags for input datasets. Accepted values
                                - posix: read data using POSIX (default)
                                - mpio: read data using MPI-IO
  --of FLAGS                  Flags for output datasets. Accepted values
                                - posix: write data using POSIX (default)
                                - mpio: write data using MPI-IO
```                                

Once a Cargo server is up and running, `ccp` can be used as follows:

```console
$ srun -N4 cargo -l ofi+tcp://192.18.0.10:62000 -o cargo.log
[...]
$ ccp -s ofi+tcp://192.18.0.10:62000 -i input0.dat input1.dat -o output0.dat output1.dat
```

Modes of operation that control how transfers should be executed can be selected
through the the `--if` and `--of` options. For now, `posix` and `mpio` modes are
supported. Note however that not all combinations are supported yet, and that 
performance will depend on whether the underlying file system supports parallel
I/O through MPI-IO.

Closes #19

See merge request !13

Resolve "Race condition when shutting down"

Closes #17

See merge request !12

Resolve "Update Spack recipe to v0.2.0"

Closes #16

See merge request !11

Resolve "Release Cargo 0.2.0"

Closes #15

See merge request !10

Resolve "`std::filesystem::filesystem_error`s not reported in log"

Closes #13

See merge request !9

1. Catch `std::system_error`s, log them, and report them as Cargo
   system errors.
2. Catch and report `std:::exception`s, log them, and report them as
   Cargo `error_code::other`

Resolve "Automatically run tests in  pipelines"

This MR enables automatic testing using `ctest`, and also 
updates the CI pipelines so that they run `build` and `test`
jobs exercising the code. We also add a `Dockerfile` that builds
an appropriate CI environment to build, test, and run Cargo.

Closes #6

Closes #6

See merge request !8

Add job for integration tests

Add `build` stages

- `cargo_ping`: Send a ping to a Cargo server
- `cargo_shutdown`: Send a shutdwon request to a Cargo server

Merge branch 'amiranda/10-support-waiting-for-a-transfer-request-to-complete-via-std-future' into 'main'

Resolve "Support waiting for a transfer request to complete"

Closes #10

See merge request !6