redpanda using docker-compose

docker-compose/transform/transform.yaml

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+# Transform metadata used by the rpk transform build command.
+# This metadata file tells rpk:
+# 1) The transform’s display name, which also becomes the base for the .wasm file name.
+# 2) A brief description of what it does.
+# 3) Defaults for environment variables.
+# 4) Input and output topics (if you want to define them here rather than in the deploy command).
+
+# Human-readable name of the transform. rpk transform build uses this for the generated .wasm file.
+name: regex
+
+description: |
+  Filters the input topic to records that only match a regular expression.
+
+  Regular expressions are implemented using Go's regexp library, which uses the syntax of RE2.
+  See the RE2 wiki for allowed syntax: https://github.com/google/re2/wiki/Syntax
+
+  Environment variables:
+  - PATTERN: The regular expression that will match against records (required).
+  - MATCH_VALUE: By default, the regex matches keys, but if set to "true", the regex matches values.
+
+# By default, no input topic is set here. (You can set it in your deploy command if preferred.)
+input-topic: ""
+
+# By default, no output topic is set here. (You can set it in your deploy command if preferred.)
+output-topic: ""
+
+# Indicates the specific TinyGo environment used to compile your transform.
+language: tinygo-no-goroutines
+
+env:
+  # The PATTERN variable must be provided at deploy time.
+  # Example: --var=PATTERN=".*@example.com"
+  PATTERN: '<required>'