only update docs site on tags

.github/workflows/build.yaml

@@ -15,6 +15,11 @@ on:
       - "*"
   # run by clicking buttons in the GitHub Actions UI
   workflow_dispatch:
+    inputs:
+      deploy-docs:
+        description: 'Update the docs site?'
+        required: true
+        type: boolean
 
 jobs:
   conda-python-build:
@@ -30,8 +35,10 @@ jobs:
   docs-build:
     needs:
       - conda-python-build
+    if: github.event_name == "tag" || github.event_name == "workflow_dispatch"
     uses: ./.github/workflows/docs-build.yaml
     with:
       script: "ci/build_docs.sh"
-      deploy: true
+      # only deploy docs on tag pushes or when someone manually runs the workflow
+      deploy: ${{ github.event_name == "tag" }} || ${{ inputs.deploy_docs == true }}
     secrets: inherit