ignore AVD-DS-0026 in trivy scan

Ignore AVD-DS-0026 (missing HEALTHCHECK in Dockerfile) reported in
`files/Dockerfile`, which is used to build `devenv` service container
image. `devenv` service container is used to run an interactive shell
and having `HEALTHCHECK` in such a service doesn't make sense.

Author: lavarou

.github/workflows/security-scan.yml

@@ -24,6 +24,7 @@ jobs:
           scan-type: fs
           scan-ref: ./php-agent
           trivy-config: ./php-agent/trivy.yaml
+          trivyignores: ./php-agent/.trivyignore
           format: table
           exit-code: 1
 
@@ -35,6 +36,7 @@ jobs:
           scan-type: fs
           scan-ref: ./php-agent
           trivy-config: ./php-agent/trivy.yaml
+          trivyignores: ./php-agent/.trivyignore
           format: sarif
           output: trivy-results.sarif
 

.trivyignore

@@ -0,0 +1,2 @@
+# Ignore missing HEALTHCHECK in Dockerfile - devenv service from files/Dockerfile doesn't need it:
+AVD-DS-0026