update: switch assets.yml to use GitHub API for artifact upload

Previous action for uploading artifacts to GitHub Releases failed due to
parallel (matrix) execution issues. Replaced it with direct GitHub API
calls to handle uploads.

This change provides more flexibility and control over artifact
management and release handling.

Added a step to generate sha256 checksum for the rootfs.img

Signed-off-by: yash-zededa <yash@zededa.com>

.github/workflows/assets.yml

@@ -20,6 +20,30 @@ on:  # yamllint disable-line rule:truthy
         type: string
 
 jobs:
+  create_release:
+    runs-on: ubuntu-latest
+    outputs:
+      release_id: ${{ steps.create_release.outputs.release_id }}
+      upload_url: ${{ steps.create_release.outputs.upload_url }}
+    steps:
+      - name: Create GitHub Release
+        id: create_release
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          response=$(curl -s -X POST \
+            -H "Authorization: Bearer $GITHUB_TOKEN" \
+            -H "Content-Type: application/json" \
+            -d '{
+              "tag_name": "${{ inputs.tag_ref }}",
+              "name": "${{ inputs.tag_ref }}",
+              "draft": false,
+              "prerelease": true
+            }' https://api.github.com/repos/${{ github.repository }}/releases)
+          release_id=$(echo "$response" | jq -r .id)
+          upload_url=$(echo "$response" | jq -r .upload_url | sed -e "s/{?name,label}//")
+          echo "release_id=$release_id" >> "$GITHUB_OUTPUT"
+          echo "upload_url=$upload_url" >> "$GITHUB_OUTPUT"
   build:
     runs-on: ubuntu-20.04
     strategy:
@@ -80,19 +104,34 @@ jobs:
           docker create --name eve_sources "$EVE_SOURCES" bash
           docker export --output assets/collected_sources.tar.gz eve_sources
           docker rm eve_sources
-      - name: Rename files for release
-        id: rename-files-for-release
+      - name: Create SHA256 checksum, rename, and upload files
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          RELEASE_ID: ${{ needs.create_release.outputs.release_id }}
+          UPLOAD_URL: ${{ needs.create_release.outputs.upload_url }}
+          ARCH: ${{ env.ARCH }}
         run: |
+          # Create SHA256 checksum for rootfs.img
+          sha256sum "assets/rootfs.img" | awk '{ print $1 }' > "assets/${ARCH}.rootfs.img.sha256"
+          # Rename files in assets to include architecture prefix if not already prefixed, then upload each one
           for asset in assets/*; do
-            mv "$asset" "assets/${{ env.ARCH }}.$(basename "$asset")"
+            base_name=$(basename "$asset")
+            # Check if the file already has the ARCH prefix
+            if [[ "$base_name" == ${ARCH}.* ]]; then
+              new_name="$base_name"  # Keep the name as is
+            else
+              new_name="${ARCH}.${base_name}"  # Add ARCH prefix
+              mv "$asset" "assets/$new_name"   # Rename the file
+            fi
+            echo "Uploading assets/$new_name as $new_name..."
+            upload_response=$(curl -s -X POST \
+              -H "Authorization: Bearer $GITHUB_TOKEN" \
+              -H "Content-Type: application/octet-stream" \
+              --data-binary @"assets/$new_name" \
+              "$UPLOAD_URL?name=$new_name")
+            if echo "$upload_response" | jq -e .id > /dev/null; then
+              echo "$new_name uploaded successfully."
+            else
+              echo "Error uploading $new_name: $upload_response"
+            fi
           done
-      - name: Upload release files
-        id: upload-release-files
-        uses: softprops/action-gh-release@v2
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        with:
-          tag_name: ${{ inputs.tag_ref }}
-          make_latest: false
-          files: |
-            assets/${{ env.ARCH }}.*