Added many, many more actions.

tpl/tpl/Dockerfile

@@ -0,0 +1,12 @@
+FROM debian:stable-slim
+
+ENV VERSION=v0.2.0
+
+RUN apt-get update
+RUN apt-get install wget -y
+RUN wget https://github.com/bluebrown/go-template-cli/releases/download/$VERSION/tpl-linux-amd64 -O /usr/bin/tpl
+RUN chmod +x /usr/bin/tpl
+
+COPY entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+ENTRYPOINT ["/entrypoint.sh"]

tpl/tpl/action.yaml

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+name: tpl
+description: "Format a Go template file given yaml file."
+inputs:
+  command:
+    description: "Arguments to pass into tpl."
+    required: false
+  catchErrors:
+    description: "Whether or not errors should be handled."
+    required: false
+outputs:
+  console:
+    description: "The console output of the tpl command."
+  exitCode:
+    description: "How the program exited."
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
+  env:
+    CATCH_ERRORS: ${{ inputs.catchErrors }}
+  args:
+  - ${{ inputs.command }}

tpl/tpl/entrypoint.sh

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+#!/bin/bash
+#See https://github.com/bluebrown/go-template-cli
+ARGS="$@"
+
+OUTPUT=$(sh -c "tpl $ARGS")
+RESULT=$?
+
+#Output multiline strings.
+#https://trstringer.com/github-actions-multiline-strings/
+if [[ -n "$OUTPUT" ]]; then
+    echo "console<<EOF" >> "$GITHUB_OUTPUT"
+    echo "$OUTPUT" >> "$GITHUB_OUTPUT"
+    echo "EOF" >> "$GITHUB_OUTPUT"
+fi
+
+echo "exitCode=$RESULT" >> "$GITHUB_OUTPUT"
+
+if [[ "$CATCH_ERRORS" != "true" ]]; then
+    exit $RESULT
+fi