Simplify the release process (no more build script or release branches) (#281)

* Simplify the release process (no more build script or release branches)

* Remove the `bin/` submodule

* npm run pack

* Use a different YAML syntax

Co-authored-by: Curtis Vogt <curtis.vogt@gmail.com>

* Use simpler (but equivalent) logic

Co-authored-by: Curtis Vogt <curtis.vogt@gmail.com>

* Fix a logic bug

* Remove some job matrices

Co-authored-by: Curtis Vogt <curtis.vogt@gmail.com>

* Intentionally fail a job (to make sure that `finalize` thus also fails)

* Revert "Intentionally fail a job (to make sure that `finalize` thus also fails)"

This reverts commit cd7944ca82.

---------

Co-authored-by: Curtis Vogt <curtis.vogt@gmail.com>

ci/check_uncommitted_changes.jl

@@ -0,0 +1,16 @@
+const cmd = `git --no-pager diff --exit-code --stat`
+
+const proc = run(pipeline(cmd; stdin, stdout, stderr); wait = false)
+
+wait(proc)
+
+@info "" success(proc) proc.exitcode
+
+if !success(proc)
+    recommended_cmd = "make everything-from-scratch"
+    msg = "##[error] found changed files after build. " *
+           "Please run `$(recommended_cmd)` and " *
+           "then check in all changes."
+    println(stderr, msg)
+    exit(1)
+end