add regctl

Dockerfile

@@ -1,6 +1,10 @@
 FROM docker:20.10-cli
 LABEL maintainer="Patrick Baber <[email protected]>"
 
+ENV REGCLIENT_VERSION "0.4.7"
+
+ARG TARGETARCH
+
 # Install essentials
 RUN apk add --no-cache \
     bash \
@@ -15,6 +19,11 @@ RUN apk add --no-cache \
     unzip \
     wget
 
+# Install regctl
+RUN if [ "$TARGETARCH" = "arm64" ]; then ARCHITECTURE="linux-arm64"; else ARCHITECTURE="linux-amd64"; fi && \
+    curl -o /usr/local/bin/regctl https://github.com/regclient/regclient/releases/download/v${REGCLIENT_VERSION}/regctl-${ARCHITECTURE} && \
+    chmod +x /usr/local/bin/regctl
+
 # Install Trivy
 COPY --from=aquasec/trivy:0.35.0 /usr/local/bin/trivy /usr/local/bin/trivy
 RUN chmod +x /usr/local/bin/trivy

README.md

@@ -11,6 +11,7 @@ Docker image with useful CI/CD tools
 - Docker Compose
 - git
 - openssl
+- regctl
 - rsync
 - sshpass
 - trivy