Environment definitions starter pack

Signed-off-by: itowlson <ivan.towlson@fermyon.com>

Author: itowlson

target-envs/README.md

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+# Spin target environments
+
+This folder contains target environment definitions for Spin. Each target
+environment is a TOML file which maps triggers to the WIT worlds supported by
+those triggers. When pushed to an OCI registry, these can be referenced
+in the Spin manifest `application.targets` array.
+
+Pushed environment definitions should not include the `.toml` extension
+and should be versioned using OCI versioning, e.g. `spin-up:3.4`
+We avoid using this convention for the source files because 1. syntax
+highlighting and 2. Windows filenames.
+
+Versions should include _minor version only_ because WITs should not
+change in patch releases.

target-envs/spin-up.3.2.toml

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+default = { worlds = ["spin:up/platform@3.2.0"] }
+
+[triggers]
+
+[triggers.http]
+worlds = ["spin:up/http-trigger@3.2.0"]
+capabilities = ["local_service_chaining"]

target-envs/spin-up.3.4.toml

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+default = { worlds = ["spin:up/platform@3.4.0"] }
+
+[triggers]
+
+[triggers.http]
+worlds = ["spin:up/http-trigger@3.4.0"]
+capabilities = ["local_service_chaining"]

target-envs/spin-up.3.5.toml

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+default = { worlds = ["spin:up/platform@3.5.0"] }
+
+[triggers]
+
+[triggers.http]
+worlds = ["spin:up/http-trigger@3.5.0", "spin:up/http-trigger@3.4.0"]
+capabilities = ["local_service_chaining"]