samedec-0.4.2: Expire/Purge Time Fix

FIXES

* Previous versions of samedec calculated `$SAMEDEC_PURGETIME`
  naively as:

      issue datetime + purge duration

  This is *almost* correct, but the SAME specification calls
  for rounding this value…

  * … to the nearest 15 minute increment for durations ≤1 hour

  * … to the nearest 30 minute increment for longer-duration
    messages

  The purge time now rounds correctly.

* Drop `slice-ring-buffer`, which had multiple
  [memory safety] issues. Testing has not revealed any ASAN
  findings in samedec v0.4.1, but we have removed this
  dependency anyway out of an abundance of caution.

OTHER

Our CI environment, Github Actions, now uses containers that
are themselves built by and within the Github Actions platform.

[memory safety]: https://rustsec.org/advisories/RUSTSEC-2025-0044

Nightly Release

This is a rolling release built from the latest develop branch.

samedec-0.4.1: Maintenance Release

This minor maintenance release helps keep our dependencies
up-to-date and building smoothly with the latest Rust.

BREAKING

* Due to low demand, CI binaries are no longer built for `-musl`
  Linux ABIs. We continue to support `-gnu` ABIs, which offer
  the best performance when available. We continue to require
  glibc >= 2.28, which makes our binaries compatible with
  Debian 10 (buster), AlmaLinux 8, and more modern distros. If
  you require a musl build, open an issue.

* Update MSRVs:

  * `sameold`: 1.70
  * `samedec`: 1.74

ENHANCEMENTS

* cargo: update dependencies to the latest-available versions.
  Minor refactors were necessary.

* ci: new builds for:

    * `aarch64-apple-darwin` (for M1 macs)
    * `i686-unknown-linux-gnu`

* doc: add [CHANGELOG.md](./CHANGELOG.md)

FIXES

* sameold: permit dead code for Demod::push()

* ci: Linux non-x86 architectures are now built by cross-compiling
  instead of emulated "native" toolchains. This is *much* faster.
  We have created custom container images for this purpose.

samedec-0.4.0: The Spring 2024 Update

Are you "Weather Ready?" This release is mostly compatible with
previous versions but adds more SAME codes and environment
variables.

ENHANCEMENTS

* Support the following new SAME codes:

  * EAN: Renamed to National Emergency Message
  * NAT: National Audible Test
  * NST: National Silent Test
  * FSW: Flash Freeze Warning
  * FZW: Freeze Warning
  * HLS: Hurricane Local Statement
  * SQW: Snow Squall Warning

* Discontinue the `SAMEDEC_SIGNIFICANCE` level of "`M`"
  (Message), which is not found anywhere in the standards
  document. The following messages are upgraded to
  Statement:

  * ADR: Administrative Message
  * NMN: Network Message Notification

* Improved detection of National Weather Service vs
  Environment Canada. samedec will no longer output a
  generic `SAMEDEC_ORIGINATOR` of "`Weather Service`."
  Instead, samedec will output either
  "`National Weather Service`" or "`Environment Canada`."

* New environment variables for child processes

  * `SAMEDEC_IS_NATIONAL`: "`Y`" for national activations;
    otherwise present but empty

  * `SAMEDEC_SIG_NUM`: a numeric representation of the
    significance level

* Add proper integration test scripts for child processes

FIXES

* IMPORTANT: Fix code entry for ADR (Administrative Message),
  which was previously wrong.

* Handle EOF within the main app. Child processes are now
  spawned even for very short input files.

* Update to Edition 2021

* Replace is-terminal with terminal_size

samedec-0.3.0: Add fallback decoding

ENHANCEMENTS

* CLI-BREAKING: Suppress duplicate messages which follow
  each other quickly in time. This mainly affects Fast EOMs:
  now only one "`NNNN`" line will be printed per SAME
  message. Some users may consider this breaking.

* CLI: Add fallback decoding which can decode SAME headers using
  only two bursts. The improved decoder adds a delay of
  **1.311 seconds** when reporting a Start Of Message. Since the
  SAME voice message is often prefixed with an extended period of
  silence and/or a Warning Alarm Tone, the additional delay
  should not impact most applications.

FIXES

* Fix decoding of back-to-back SAME messages when either or both
  have missed bursts

* Update dependencies

samedec-0.2.5: CLI Improvements

ENHANCEMENTS

* Update to chrono 0.4.23 and replace
  deprecated functions.

* Update to clap v4. Improve help text and
  general CLI behaviors.

FIXES

* samedec now errors on startup if reading
  from stdin and stdin is a terminal

samedec-0.2.4: Maintenance release

CI binaries are now available on the Github
Releases tab. These binaries are built with
Github Actions on Github Workers.

ENHANCEMENTS

* Log the full text of each SAME burst

FIXES

* RUSTSEC-2022-0078: bump bumpalo to 3.12.0

* RUSTSEC-2021-0047: replace slice-deque with
  slice-ring-buffer

* Documentation improvements