Fix: R2 doesn't support CRC32 validation yet, while "aws s3" demands …

…it (attempt #2)

The last fix fixed the issue for AWS CLI 2.23.6, but GitHub Runner
still has 2.23.2, which seemly does not support to workaround.
As such, downgrading is the better option.

.github/workflows/update-cdn.yml

@@ -48,6 +48,15 @@ jobs:
         python -m pip install --upgrade pip
         pip install -r cdn/requirements.txt
 
+        # Since AWS CLI 2.23, AWS enabled strict validation of checksums. Cloudflare R2 doesn't support
+        # this at this moment. We need to install an older version of the AWS CLI to work around this.
+        # See https://www.cloudflarestatus.com/incidents/t5nrjmpxc1cj for more information.
+
+        curl "https://awscli.amazonaws.com/awscli-exe-linux-x86_64-2.22.28.zip" -o "awscliv2.zip"
+        unzip -q awscliv2.zip
+        ./aws/install --bin-dir ~/.local/bin --install-dir ~/.aws-cli
+        rm -rf awscliv2.zip aws
+
     # By default, mime.types doesn't include one for YAML files. This results
     # in empty content-type on the CDN, which means browsers want to download
     # the file instead of showing it inline. By adding this entry to
@@ -66,9 +75,7 @@ jobs:
           --bucket-id ${{ secrets.CDN_R2_BUCKET }} \
           --new-release ${{ inputs.folder || github.event.client_payload.folder }}/${{ inputs.version || github.event.client_payload.version }}
 
-        # Disable CRC validation, as currently Cloudflare R2 doesn't support this yet.
-        # See https://www.cloudflarestatus.com/incidents/t5nrjmpxc1cj for more information.
-        AWS_REQUEST_CHECKSUM_CALCULATION=WHEN_REQUIRED AWS_RESPONSE_CHECKSUM_VALIDATION=WHEN_REQUIRED aws s3 cp \
+        aws s3 cp \
           --recursive \
           --endpoint-url ${{ secrets.CDN_R2_ENDPOINT }} \
           --only-show-errors \