Fix security scan issues and harden docker-compose

Hadolint fixes:
- Use printf instead of echo for escape sequences
- Add hadolint ignore for apt pin version (DL3008)

KICS fixes (docker-compose):
- Add security_opt: no-new-privileges to all services
- Add mem_limit and cpus to prevent resource exhaustion
- Add healthcheck to orchard-server in docker-compose.yml

Gitleaks:
- Add .gitleaksignore for false positive (s3_key attribute name)
- Remove allow_failure from secrets job (now blocking)

Also:
- Remove || echo fallback from python_tests (tests should fail pipeline)

docker-compose.local.yml

@@ -42,6 +42,10 @@ services:
       timeout: 3s
       start_period: 10s
       retries: 3
+    security_opt:
+      - no-new-privileges:true
+    mem_limit: 1g
+    cpus: 1.0
 
   postgres:
     image: postgres:16-alpine
@@ -62,6 +66,10 @@ services:
     networks:
       - orchard-network
     restart: unless-stopped
+    security_opt:
+      - no-new-privileges:true
+    mem_limit: 512m
+    cpus: 0.5
 
   minio:
     image: minio/minio:latest
@@ -82,6 +90,10 @@ services:
     networks:
       - orchard-network
     restart: unless-stopped
+    security_opt:
+      - no-new-privileges:true
+    mem_limit: 512m
+    cpus: 0.5
 
   minio-init:
     image: minio/mc:latest
@@ -97,6 +109,10 @@ services:
       "
     networks:
       - orchard-network
+    security_opt:
+      - no-new-privileges:true
+    mem_limit: 128m
+    cpus: 0.25
 
   redis:
     image: redis:7-alpine
@@ -113,6 +129,10 @@ services:
     networks:
       - orchard-network
     restart: unless-stopped
+    security_opt:
+      - no-new-privileges:true
+    mem_limit: 256m
+    cpus: 0.25
 
 volumes:
   postgres-data-local: