fix: replace aws-cli with curl for S3 checks to avoid python3 dependency issues on Alpine 3.23

.crow/build.yaml

@@ -100,18 +100,13 @@ steps:
 
 
   - name: Check if files for R version already exist in s3
-    environment:
-      AWS_ACCESS_KEY_ID:
-        from_secret: HETZNER_S3_ACCESS_KEY_K3S
-      AWS_SECRET_ACCESS_KEY:
-        from_secret: HETZNER_S3_SECRET_KEY_K3S
-      AWS_ENDPOINT_URL: https://fsn1.your-objectstorage.com
     image: reg.devxy.io/docker.io/library/alpine:3.23
     commands:
-      - apk add -q --no-cache aws-cli
+      - apk add -q --no-cache curl
       - |
           VERSION=$(cat r-version-to-build.txt)
-          aws s3 ls s3://devxy-r-builds/${PLATFORM_ID}/ | \
+          curl -s "https://fsn1.your-objectstorage.com/devxy-r-builds?prefix=${PLATFORM_ID}/" | \
+            grep -oP '<Key>[^<]+</Key>' | sed 's/<[^>]*>//g' | \
             awk -v arch="${ARCH_ID}" -v ver="${VERSION}" \
               '$0 ~ arch && $0 ~ ver {print substr($NF, 3, 5)}' > r-version-s3.txt
       - cat r-version-s3.txt
@@ -130,8 +125,7 @@ steps:
     commands: |
       # docker info
       if ! grep -qF "$(cat r-version-to-build.txt)" r-version-s3.txt; then
-        apk add -q --no-cache py3-pip make just aws-cli docker-compose
-        pip3 install -q b2 --break-system-packages
+        apk add -q --no-cache make just docker-compose
         just build-r-${PLATFORM} $(cat r-version-to-build.txt)
       fi
     backend_options: