docs: update Swift Publish

- enhance cache
- pin version to 0.7.0

README.md

@@ -1071,22 +1071,26 @@ jobs:
     steps:
       - uses: actions/checkout@v2
 
+      - uses: actions/cache@v2
+        with:
+          path: |
+            ~/Publish_build
+            .build
+          key: ${{ runner.os }}-spm-${{ hashFiles('**/Package.resolved') }}
+          restore-keys: |
+            ${{ runner.os }}-spm-
+
       - name: Setup JohnSundell/Publish
         run: |
           cd ${HOME}
+          export PUBLISH_VERSION="0.7.0"
           git clone https://github.com/JohnSundell/Publish.git
-          cd ./Publish
-          git checkout 0.7.0
+          cd ./Publish && git checkout ${PUBLISH_VERSION}
+          mv ~/Publish_build .build || true
           swift build -c release
+          cp -r .build ~/Publish_build || true
           echo "${HOME}/Publish/.build/release" >> ${GITHUB_PATH}
 
-      - uses: actions/cache@v2
-        with:
-          path: .build
-          key: ${{ runner.os }}-spm-${{ hashFiles('**/Package.resolved') }}
-          restore-keys: |
-            ${{ runner.os }}-spm-
-
       - run: publish-cli generate
 
       - name: Deploy to GitHub Pages