ci: doc-publish: Publish API coverage docs only when available

The API coverage documentation support was (relatively) recently introduced
in bad87f1684 and is not available in older
release branches.

Since doc-publish workflows always run in the default (main) branch
context, it is necessary to make the API coverage documentation handling
optional for the workflow runs that are triggered from older release
branches.

Signed-off-by: Stephanos Ioannidis <root@stephanos.io>

.github/workflows/doc-publish-pr.yml

@@ -46,7 +46,9 @@ jobs:
     - name: Uncompress HTML docs
       run: |
         tar xf html-output/html-output.tar.xz -C html-output
+        if [ -f api-coverage/api-coverage.tar.xz ]; then
           tar xf api-coverage/api-coverage.tar.xz -C api-coverage
+        fi
 
     - name: Configure AWS Credentials
       uses: aws-actions/configure-aws-credentials@v2
@@ -62,6 +64,8 @@ jobs:
         aws s3 sync --quiet html-output/html \
           s3://builds.zephyrproject.org/${{ github.event.repository.name }}/pr/${PR_NUM}/docs \
           --delete
+        if [ -d api-coverage/coverage-report ]; then
           aws s3 sync --quiet api-coverage/coverage-report/ \
             s3://builds.zephyrproject.org/${{ github.event.repository.name }}/pr/${PR_NUM}/api-coverage \
             --delete
+        fi

.github/workflows/doc-publish.yml

@@ -32,7 +32,9 @@ jobs:
     - name: Uncompress HTML docs
       run: |
         tar xf html-output/html-output.tar.xz -C html-output
+        if [ -f api-coverage/api-coverage.tar.xz ]; then
           tar xf api-coverage/api-coverage.tar.xz -C api-coverage
+        fi
 
     - name: Configure AWS Credentials
       uses: aws-actions/configure-aws-credentials@v2
@@ -53,5 +55,7 @@ jobs:
 
         aws s3 sync --quiet html-output/html s3://docs.zephyrproject.org/${VERSION} --delete
         aws s3 sync --quiet html-output/html/doxygen/html s3://docs.zephyrproject.org/apidoc/${VERSION} --delete
+        if [ -d api-coverage/coverage-report ]; then
           aws s3 sync --quiet api-coverage/coverage-report/ s3://docs.zephyrproject.org/api-coverage/${VERSION} --delete
+        fi
         aws s3 cp --quiet pdf-output/zephyr.pdf s3://docs.zephyrproject.org/${VERSION}/zephyr.pdf