Create Dockerfile and action.yml

Dockerfile

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+FROM ghcr.io/blueprintframework/blueprint:v1.11.10
+
+ENV BASE_DIR=/srv/pterodactyl
+
+COPY /github/workspace/. /srv/pterodactyl/.blueprint/dev/
+
+RUN blueprint -build
+
+RUN identifier=$(cat /srv/pterodactyl/.blueprint/dev/conf.yml | grep -m 1 "identifier:" | cut -d ":" -f2 | xargs) && \
+    cp /srv/pterodactyl/${identifier}.blueprint /github/workspace/${identifier}.blueprint && \
+    echo "${identifier}.blueprint" >> $GITHUB_OUTPUT

action.yml

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+name: 'Blueprint Build'
+description: 'Builds a blueprint addon'
+outputs:
+  file:
+    description: 'The path to the built addon file'
+runs:
+  using: 'docker'
+  image: 'Dockerfile'