fix(ci): ignore failing peer resolution

Some 3rd party nest packages depend on Nest 7 while we use 8. In practice
this still works, but the usual dependency resolution fails and requires
an explicit override.

This should also unblock auto-merging for renovate, as that currently fails
in CI on the `npm ci` step.

.github/workflows/ci.yaml

@@ -22,7 +22,7 @@ jobs:
         with:
           node-version: 16
 
-      - run: npm ci
+      - run: npm ci --legacy-peer-deps
       - run: npm run build
       - run: npm run lint:api
       - run: npm run test:cov
@@ -51,7 +51,7 @@ jobs:
         with:
           node-version: 16
 
-      - run: npm ci
+      - run: npm ci --legacy-peer-deps
 
       - run: npm ci
         working-directory: frontend