Created SC3056 (markdown)

SC3056.md

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+## In POSIX sh, name matching prefixes are undefined.
+
+(or "In dash, ... are not supported." when using `dash`)
+
+### Problematic code:
+
+```sh
+#!/bin/sh
+echo "${!ANDROID_*}"
+```
+
+### Correct code:
+
+The easiest solution is to switch to a shell that *does* support name matching prefixes, like `bash`:
+
+```sh
+#!/bin/bash
+echo "${!ANDROID_*}"
+```
+
+Alternatively, extract the data you want from `env` or `set`
+
+### Rationale:
+
+Using `${!name*}` to find all variable names with a given prefix is a bash and ksh extension that `dash` and POSIX `sh` does not support.
+
+### Exceptions:
+
+If you only intend to target shells that supports this feature, you can change
+the shebang to a shell that guarantees support, or [[ignore]] this warning.
+
+You can use `# shellcheck disable=SC3000-SC4000` to ignore all such compatibility
+warnings.
+
+### Related resources:
+
+* Help by adding links to BashFAQ, StackOverflow, man pages, POSIX, etc!