ci: fix package basename

.drone.yml

@@ -6,17 +6,20 @@ name: default
 steps:
   - name: build:binary
     image: crystallang/crystal:1.7.3
+    environment:
+      PACKAGE_BASENAME: mfm_linux_amd64
     volumes:
       - name: cache
         path: /_cache
     commands:
       - pwd
-      - apt-get update && apt-get install -y cmake g++ libevent-dev libpcre3-dev libyaml-dev
+      - apt-get update && 
+          apt-get install -y cmake g++ libevent-dev libpcre3-dev libyaml-dev
       - shards install
       - shards build --production --static
       - strip bin/mfm
       - mkdir -p /_cache/bin
-      - cp -r bin/mfm /_cache/bin/mfm_linux_amd64
+      - cp -r bin/mfm /_cache/bin/$PACKAGE_BASENAME
 
   - name: publish:tag
     image: curlimages/curl
@@ -36,7 +39,7 @@ steps:
       - env |grep DRONE
       - |
         curl -H "Authorization: token $PACKAGE_UPLOAD_TOKEN" \
-             --upload-file /_cache/bin/mfm_amd64 \
+             --upload-file /_cache/bin/$PACKAGE_BASENAME \
            $PACKAGE_UPLOAD_URL/$DRONE_TAG/$PACKAGE_BASENAME
 
 # FIXME: handle multi-arch