Make Docker healthcheck configurable via environment variables

Add environment variables to allow customization of healthcheck parameters:
- HEALTHCHECK_INTERVAL (default: 2m)
- HEALTHCHECK_TIMEOUT (default: 10s)
- HEALTHCHECK_START_PERIOD (default: 2m)
- HEALTHCHECK_RETRIES (default: 3)

This allows users to adjust healthcheck behavior for their specific needs,
especially for large database migrations that may take longer during upgrades.

Author: seuros

Dockerfile

@@ -46,7 +46,16 @@ LABEL maintainer="[email protected]"
 
 EXPOSE 22 3000
 
-HEALTHCHECK --interval=30s --timeout=10s --start-period=30s --retries=3 \
+# Set default healthcheck parameters (can be overridden at runtime)
+ENV HEALTHCHECK_INTERVAL=2m \
+    HEALTHCHECK_TIMEOUT=10s \
+    HEALTHCHECK_START_PERIOD=2m \
+    HEALTHCHECK_RETRIES=3
+
+HEALTHCHECK --interval=${HEALTHCHECK_INTERVAL} \
+            --timeout=${HEALTHCHECK_TIMEOUT} \
+            --start-period=${HEALTHCHECK_START_PERIOD} \
+            --retries=${HEALTHCHECK_RETRIES} \
   CMD curl -f http://localhost:3000/api/healthz || exit 1
 
 RUN apk --no-cache add \

Dockerfile.rootless

@@ -44,7 +44,16 @@ LABEL maintainer="[email protected]"
 
 EXPOSE 2222 3000
 
-HEALTHCHECK --interval=30s --timeout=10s --start-period=30s --retries=3 \
+# Set default healthcheck parameters (can be overridden at runtime)
+ENV HEALTHCHECK_INTERVAL=2m \
+    HEALTHCHECK_TIMEOUT=10s \
+    HEALTHCHECK_START_PERIOD=2m \
+    HEALTHCHECK_RETRIES=3
+
+HEALTHCHECK --interval=${HEALTHCHECK_INTERVAL} \
+            --timeout=${HEALTHCHECK_TIMEOUT} \
+            --start-period=${HEALTHCHECK_START_PERIOD} \
+            --retries=${HEALTHCHECK_RETRIES} \
   CMD curl -f http://localhost:3000/api/healthz || exit 1
 
 RUN apk --no-cache add \