cache data (observablehq#804)

* cache data

* cache examples, too

.github/workflows/deploy.yml

@@ -23,6 +23,17 @@ jobs:
  yarn.lock
  'examples/*/yarn.lock'
  - run: yarn --frozen-lockfile
+ - id: date
+ run: echo "date=$(TZ=America/Los_Angeles date +'%Y-%m-%d')" >> $GITHUB_OUTPUT
+ - id: cache-data
+ uses: actions/cache@v4
+ with:
+ path: |
+ docs/.observablehq/cache
+ 'examples/*/docs/.observablehq/cache'
+ key: data-${{ hashFiles('docs/data/*', 'examples/*/docs/data/*') }}-${{ steps.date.outputs.date }}
+ - if: steps.cache-data.outputs.cache-hit == 'true'
+ run: find docs/.observablehq/cache examples/*/docs/.observablehq/cache -type f -exec touch {} +
  - run: yarn build
  - name: Build example "api"
  run: yarn --frozen-lockfile && yarn build