feat: add retry option

Dockerfile

@@ -15,6 +15,8 @@ ARG CONTAINER_LIBRARY
 ENV CADDY_VERSION="${CADDY_VERSION:-v2.6.2}"
 # renovate: datasource=github-releases depName=thegeeklab/wait-for
 ENV WAIT_FOR_VERSION="${WAIT_FOR_VERSION:-v0.2.0}"
+# renovate: datasource=github-releases depName=thegeeklab/retry
+ENV RETRY_VERSION="${RETRY_VERSION:-v0.3.0}"
 # renovate: datasource=git-tags depName=https://gitea.rknet.org/docker/container-library
 ENV CONTAINER_LIBRARY="${CONTAINER_LIBRARY:-v0.1.3}"
 
@@ -27,8 +29,10 @@ RUN apt-get update && apt-get install -y curl bash ncat media-types && \
     curl -SsfL "https://gitea.rknet.org/docker/container-library/releases/download/${CONTAINER_LIBRARY}/container-library.tar.gz" | tar xz -C / && \
     curl -sSL "https://github.com/caddyserver/caddy/releases/download/${CADDY_VERSION}/caddy_${CADDY_VERSION##v}_linux_amd64.tar.gz" | tar xz -C /usr/local/bin caddy && \
     curl -SsfL -o /usr/local/bin/wait-for "https://github.com/thegeeklab/wait-for/releases/download/${WAIT_FOR_VERSION}/wait-for" && \
+    curl -SsfL -o /usr/local/bin/retry "https://github.com/thegeeklab/retry/releases/download/${RETRY_VERSION}/retry" && \
     chmod 755 /usr/local/bin/caddy && \
     chmod 755 /usr/local/bin/wait-for && \
+    chmod 755 /usr/local/bin/retry && \
     rm -rf /var/lib/apt/lists/* && \
     rm -rf /tmp/* && \
     rm -rf /root/.cache/

README.md

@@ -25,6 +25,7 @@ docker run -v $(pwd)/public:/drone/src link-validator -e
 ```Shell
 LINK_VALIDATOR_BASE_DIR=/drone/src
 LINK_VALIDATOR_SERVER_PORT=8000
+LINK_VALIDATOR_RETRIES=0
 ```
 
 ## Build

overlay/bin/link-validator

@@ -13,4 +13,4 @@ log_info "Wait for web server on '$URL'"
 /usr/local/bin/wait-for "$URL"
 
 log_info "Start linkcheck"
-exec /usr/local/bin/linkcheck "$@" "$URL"
+exec retry -t "${LINK_VALIDATOR_RETRIES:-0}" -- /usr/local/bin/linkcheck "$@" "$URL"