Initial signing support (#1345)

* Add CLI options

* Add manifest types

* Thread signature policy through to fetchers

* Thread signing section through from metadata

* Implement signing validation

* Clippy

* Attempt testing

* Yes and

* Why

* fmt

* Update crates/bin/src/args.rs

Co-authored-by: Jiahao XU <Jiahao_XU@outlook.com>

* Update crates/binstalk-fetchers/src/gh_crate_meta.rs

Co-authored-by: Jiahao XU <Jiahao_XU@outlook.com>

* Update crates/bin/src/args.rs

Co-authored-by: Jiahao XU <Jiahao_XU@outlook.com>

* Update crates/binstalk-fetchers/src/signing.rs

Co-authored-by: Jiahao XU <Jiahao_XU@outlook.com>

* Update crates/binstalk-fetchers/src/signing.rs

Co-authored-by: Jiahao XU <Jiahao_XU@outlook.com>

* Update crates/binstalk-fetchers/src/signing.rs

Co-authored-by: Jiahao XU <Jiahao_XU@outlook.com>

* Update crates/binstalk-fetchers/src/signing.rs

Co-authored-by: Jiahao XU <Jiahao_XU@outlook.com>

* fixes

* Finish feature

* Document

* Include all fields in the signing.file template

* Readme document

* Review fixes

* Fail on non-utf8 sig

* Thank goodness for tests

* Run test in ci

* Add rsign2 commands

* Log utf8 error

* Update e2e-tests/signing.sh

Co-authored-by: Jiahao XU <Jiahao_XU@outlook.com>

* Fix `e2e-tests/signing.sh` MacOS CI failure

Move the tls cert creation into `signing.sh` and sleep for 10s to wait
for https server to start.

Signed-off-by: Jiahao XU <Jiahao_XU@outlook.com>

* Refactor e2e-tests-signing files

 - Use a tempdir generated by `mktemp` for all certificates-related
   files
 - Put other checked-in files into `e2e-tests/signing`

Signed-off-by: Jiahao XU <Jiahao_XU@outlook.com>

* Fixed `e2e-tests-signing` connection err in MacOS CI

Wait for server to start up by trying to connect to it.

Signed-off-by: Jiahao XU <Jiahao_XU@outlook.com>

* Fix `e2e-tests-signing` passing `-subj` to `openssl` on Windows

Use single quote instead of double quote to avoid automatic expansion
from bash

Signed-off-by: Jiahao XU <Jiahao_XU@outlook.com>

* Fix `e2e-tests-signing` waiting for server to startup

Remove `timeout` since it is not supported on MacOS.

Signed-off-by: Jiahao XU <Jiahao_XU@outlook.com>

* Try to fix windows CI by setting `MSYS_NO_PATHCONV=1` on `openssl` cmds

Signed-off-by: Jiahao XU <Jiahao_XU@outlook.com>

* Fixed `e2e-tests-signing` on windows

By using double `//` for the value passed to option `-subj`

Signed-off-by: Jiahao XU <Jiahao_XU@outlook.com>

* Fixed infinite loop in `signing/wait-for-server` on Windows

Pass `--ssl-revoke-best-effort` to prevent schannel from checking ssl
revocation status.

Signed-off-by: Jiahao XU <Jiahao_XU@outlook.com>

* Add cap on retry attempt in `signing/wait-for-server.sh`

Signed-off-by: Jiahao XU <Jiahao_XU@outlook.com>

* Let `singing/server.py` print output to stderr

so that we can see the error message there.

Signed-off-by: Jiahao XU <Jiahao_XU@outlook.com>

* Fix running `signing/server.py` on MacOS CI

use `python3` since macos-latest still has python2 installed and
`python` is a symlink to `python2` there.

Signed-off-by: Jiahao XU <Jiahao_XU@outlook.com>

---------

Signed-off-by: Jiahao XU <Jiahao_XU@outlook.com>
Co-authored-by: Jiahao XU <Jiahao_XU@outlook.com>

e2e-tests/manifests/signing-Cargo.toml

@@ -0,0 +1,19 @@
+[package]
+name = "signing-test"
+description = "Rust binary package installer for CI integration"
+version = "0.1.0"
+authors = ["ryan <ryan@kurte.nz>"]
+edition = "2021"
+license = "GPL-3.0"
+
+[[bin]]
+name = "signing-test"
+path = "src/main.rs"
+
+[package.metadata.binstall]
+pkg-url = "https://localhost:4443/signing-test.tar"
+pkg-fmt = "tar"
+
+[package.metadata.binstall.signing]
+algorithm = "minisign"
+pubkey = "RWRnmBcLmQbXVcEPWo2OOKMI36kki4GiI7gcBgIaPLwvxe14Wtxm9acX"