diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..1e70e96
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,9 @@
+FROM python:3.8-alpine
+
+ENV AWSCLI_VERSION='1.17.1'
+
+RUN pip install --quiet --no-cache-dir awscli==${AWSCLI_VERSION}
+RUN pip install --quiet --no-cache-dir mkdocs
+
+ADD entrypoint.sh /entrypoint.sh
+ENTRYPOINT ["/entrypoint.sh"]
diff --git a/action.yml b/action.yml
new file mode 100644
index 0000000..b6960c6
--- /dev/null
+++ b/action.yml
@@ -0,0 +1,9 @@
+name: "mkdocs2S3"
+description: "Github action to build an MkDocs site and upload to S3"
+author: thomasattree
+runs:
+  using: docker
+  image: Dockerfile
+branding:
+  icon: refresh-cw
+  color: green
diff --git a/entrypoint.sh b/entrypoint.sh
new file mode 100644
index 0000000..e0bab19
--- /dev/null
+++ b/entrypoint.sh
@@ -0,0 +1,54 @@
+#!/bin/sh
+
+set -e
+
+if [ -z "$AWS_S3_BUCKET" ]; then
+  echo "AWS_S3_BUCKET is not set."
+  exit 1
+fi
+
+if [ -z "$AWS_ACCESS_KEY_ID" ]; then
+  echo "AWS_ACCESS_KEY_ID is not set."
+  exit 1
+fi
+
+if [ -z "$AWS_SECRET_ACCESS_KEY" ]; then
+  echo "AWS_SECRET_ACCESS_KEY is not set."
+  exit 1
+fi
+
+# Default to eu-west-1 if AWS_REGION not set.
+if [ -z "$AWS_REGION" ]; then
+  AWS_REGION="eu-west-1"
+  echo "Using default region eu-west-1."
+fi
+
+# Build our mkdocs site.
+mkdocs build
+
+# Create a dedicated profile for this action to avoid conflicts
+# with past/future actions.
+aws configure --profile s3-sync-action <<-EOF > /dev/null 2>&1
+${AWS_ACCESS_KEY_ID}
+${AWS_SECRET_ACCESS_KEY}
+${AWS_REGION}
+text
+EOF
+
+# Sync using our dedicated profile and suppress verbose messages.
+# All other flags are optional via the `args:` directive.
+sh -c "aws s3 sync ${SOURCE_DIR:-.} s3://${AWS_S3_BUCKET}/${DEST_DIR} \
+              --profile s3-sync-action \
+              --no-progress \
+              ${ENDPOINT_APPEND} $*"
+
+# Clear out credentials after we're done.
+# We need to re-run `aws configure` with bogus input instead of
+# deleting ~/.aws in case there are other credentials living there.
+# https://forums.aws.amazon.com/thread.jspa?threadID=148833
+aws configure --profile s3-sync-action <<-EOF > /dev/null 2>&1
+null
+null
+null
+text
+EOF