Add initial OCI spec for container for #655

.dockerignore

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+# Ignore everything
+*
+!/src/validations/constraints

Dockerfile

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+ARG GIT_IMAGE=bitnami/git:2.46.0
+ARG MAVEN_IMAGE=maven:3.9.8-eclipse-temurin-21
+ARG MAVEN_DEP_PLUGIN_VERSION=3.8.0
+ARG OSCAL_CLI_VERSION=2.0.2
+ARG OSCAL_CLI_INSTALL_PATH=/opt/oscal
+
+FROM ${MAVEN_IMAGE} as cli_downloader
+ARG MAVEN_DEP_PLUGIN_VERSION
+ARG OSCAL_CLI_VERSION
+ARG OSCAL_CLI_INSTALL_PATH
+RUN apt-get update -y && \
+    apt-get install -y unzip && \
+    mkdir -p /opt/oscal-cli && \
+    mvn \
+    org.apache.maven.plugins:maven-dependency-plugin:${MAVEN_DEP_PLUGIN_VERSION}:copy \
+    -DoutputDirectory=/opt/oscal-cli \
+    -DremoteRepositories=https://repo1.maven.org/maven2 \
+    -Dartifact=dev.metaschema.oscal:oscal-cli-enhanced:${OSCAL_CLI_VERSION}:zip:oscal-cli && \
+    cd /opt/oscal-cli && unzip *.zip && rm -f *.zip
+
+FROM cli_downloader
+LABEL org.opencontainers.image.authors="FedRAMP Automation Team <[email protected]>"
+LABEL org.opencontainers.image.documentation="https://automate.fedramp.gov"
+LABEL org.opencontainers.image.source="https://github.com/GSA/fedramp-automation/tree/main/Dockerfile"
+LABEL org.opencontainers.image.vendor="GSA Technology Transformation Services"
+LABEL org.opencontainers.image.title="FedRAMP Validation Tools"
+LABEL org.opencontainers.image.description="FedRAMP's tools for validating OSCAL data"
+LABEL org.opencontainers.image.licenses="CC0-1.0"
+ARG OSCAL_CLI_INSTALL_PATH
+COPY --from=cli_downloader /opt/oscal-cli /opt/
+RUN mkdir -p /opt/fedramp
+ENV PATH="$PATH:/opt/oscal-cli/bin"
+WORKDIR /app
+ENTRYPOINT [ "/opt/oscal-cli/bin/oscal-cli" ]