feature(caddy-pmtiles): add Caddyfile

Caddyfile

@@ -0,0 +1,17 @@
+{
+  # to use handle_path for prefixes, pmtiles_proxy must have a defined
+  # position in the ordering of handlers.
+  order pmtiles_proxy before reverse_proxy
+  email ${MAPS_EMAIL}
+}
+
+${MAPS_DOMAIN} {
+  handle_path /tiles/* {
+    pmtiles_proxy {
+      bucket ${MAPS_PMTILES_LOCATION}
+      cache_size 19000
+      # used to embed a tiles URL in TileJSON.
+      public_url https://${MAPS_DOMAIN}/tiles
+    }
+  }
+}

Dockerfile

@@ -4,4 +4,13 @@ RUN xcaddy build --with github.com/caddy-dns/cloudflare --with github.com/protom
 
 FROM caddy:2.8.4
 
+# Install envsubst
+RUN apk update && apk add gettext && rm -rf /var/cache/apk/*
+
 COPY --from=builder /usr/bin/caddy /usr/bin/caddy
+COPY Caddyfile /etc/caddy/Caddyfile.template
+COPY entrypoint.sh /entrypoint.sh
+
+RUN chmod +x /entrypoint.sh
+
+ENTRYPOINT ["/entrypoint.sh"]

entrypoint.sh

@@ -0,0 +1,20 @@
+#!/bin/sh
+set -e
+
+# Debug: print environment variables
+echo "Environment variables:"
+echo "MAPS_DOMAIN=${MAPS_DOMAIN}"
+echo "MAPS_PMTILES_LOCATION=${MAPS_PMTILES_LOCATION}"
+echo "MAPS_EMAIL=${MAPS_EMAIL}"
+
+# Replace environment variables in Caddyfile
+export MAPS_DOMAIN
+export MAPS_PMTILES_LOCATION
+export MAPS_EMAIL
+envsubst '${MAPS_DOMAIN} ${MAPS_PMTILES_LOCATION} ${MAPS_EMAIL}' < /etc/caddy/Caddyfile.template > /etc/caddy/Caddyfile
+
+echo "Caddyfile:"
+cat /etc/caddy/Caddyfile
+
+# Execute Caddy
+exec /usr/bin/caddy run --config /etc/caddy/Caddyfile