Add Create Umbrella Task For All Test Tasks as a Mise TIL

mise/create-umbrella-task-for-all-test-tasks.md

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+# Create Umbrella Task For All Test Tasks
+
+When I was first sketching out the [`mise`
+tasks](https://mise.jdx.dev/tasks/running-tasks.html) for a Rails app, I added
+the following two tasks. One is for running all the `rspec` tests. The Other is
+for running all the `vitest` (JavaScript) tests.
+
+```toml
+[tasks."test:rspec"]
+run = "unbuffer bundle exec rspec"
+description = "Run RSpec tests"
+depends = ["bundle-install"]
+
+[tasks."test:vitest"]
+run = "unbuffer yarn test run"
+description = "Run Vitest tests"
+depends = ["node-install"]
+```
+
+I didn't want to have to invoked both of this individually every time I wanted
+to run the full suite. So I added a `test:all` task to do it all.
+
+```toml
+[tasks."test:all"]
+description = "Run all tests (RSpec and Vitest)"
+run = [
+  "unbuffer bundle exec rspec",
+  "unbuffer yarn test run",
+]
+description = "Run RSpec tests"
+depends = ["bundle-install", "node-install"]
+```
+
+This worked (for now). But it ate at me, for a couple reasons. I had to
+duplicate everything about the existing `test:rspec` and `test:vitest` tasks.
+And this didn't account for a new kind of test task being added (e.g.
+`test:e2e`).
+
+Instead, I can rely on `depends` and wildcards to achieve this without the
+duplication which makes it more future-proof.
+
+```toml
+[tasks."test:all"]
+description = "Run all tests (RSpec and Vitest)"
+depends = ["test:*"]
+```
+
+Running `mise run test:all` won't execute its own command, but because it
+depends on all other `test:*` tasks, the tests will get run through those
+dependencies.
+
+This task naming pattern also allows for calling all tests with `mise run
+"test:**"`.