fix(ci): use plain param substitution for image tag (this Argo doesn't eval {{=...}})

The {{=sprig.trunc(...)}} expression wasn't evaluated by this Argo (v4.0.6) —
Kaniko received it literally and rejected it as an invalid tag. Use the plain
{{workflow.parameters.commit-sha}} substitution (which works everywhere else
in this template); the full 40-char sha is a valid Docker tag, no trunc needed.

infra/argo/fxhnt-cockpit-workflowtemplate.yaml

@@ -129,7 +129,7 @@ spec:
           - --context=/workspace/src
           - --dockerfile=/workspace/src/infra/docker/fxhnt.Dockerfile
           - --destination=rg.fr-par.scw.cloud/bizworx/fxhnt-cockpit:latest
-          - --destination=rg.fr-par.scw.cloud/bizworx/fxhnt-cockpit:{{=sprig.trunc(7, workflow.parameters.commit-sha)}}
+          - --destination=rg.fr-par.scw.cloud/bizworx/fxhnt-cockpit:{{workflow.parameters.commit-sha}}
           - --cache=true
           - --cache-repo=rg.fr-par.scw.cloud/bizworx/cache
           - --snapshot-mode=redo