Added many, many more actions.

mono/mono/Dockerfile

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+FROM debian:stable-slim
+
+ENV NUGET_VERSION=v6.5.0
+
+RUN apt-get update
+RUN apt-get install -y --no-install-recommends \
+    bash \
+    wget \
+    mono-complete \
+    tzdata
+
+RUN apt-get clean
+RUN rm -rf /var/lib/apt/lists/*
+
+RUN wget https://dist.nuget.org/win-x86-commandline/$NUGET_VERSION/nuget.exe -O /usr/bin/nuget.exe
+RUN chmod +x /usr/bin/nuget.exe
+
+COPY entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+ENTRYPOINT ["/entrypoint.sh"]

mono/mono/action.yaml

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+name: mono
+description: "Run mono commands."
+inputs:
+  command:
+    description: "Shell arguments to pass into mono."
+    required: true
+  program:
+    description: "Program to run instead of mono. Default: mono"
+    required: false
+    default: "mono"
+  catchErrors:
+    description: "Whether or not errors should be handled."
+    required: false
+outputs:
+  console:
+    description: "The console output of the command."
+runs:
+  env:
+    PROGRAM: ${{ inputs.program }}
+    CATCH_ERRORS: ${{ inputs.catchErrors }}
+  using: docker
+  image: Dockerfile
+  args:
+  - ${{ inputs.command }}

mono/mono/entrypoint.sh

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+#!/bin/bash
+COMMAND="$@"
+
+PROGRAM=${PROGRAM:-"mono"}
+OUTPUT=$(bash -c "$PROGRAM $COMMAND")
+RESULT=$?
+
+#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