Bump eec-campaigns to v0.1.7, scope sync to changed campaigns

Only the campaign(s) whose files changed in this push get resolved and
diffed against listmonk now, instead of every campaign every time --
falls back to a full scan automatically if the before-commit can't be
determined. fetch-depth: 0 so that commit is always available to diff
against locally.

.gitea/workflows/test.yml

@@ -22,7 +22,7 @@ jobs:
           go-version: "1.23.1"
 
       - name: Install eec-campaigns
-        run: go install gitea.reground.org/will/eec-campaigns@v0.1.6
+        run: go install gitea.reground.org/will/eec-campaigns@v0.1.7
 
       - name: Send preview
         run: eec-campaigns test "${{ inputs.slug }}" "${{ inputs.email }}"