Added support for Magma version tags (#2247)

scripts/start-deployMagma

@@ -4,9 +4,11 @@
 . "${SCRIPTS:-/}start-utils"
 isDebugging && set -x
 
+: "${MAGMA_VERSION:=}"
+
 resolveVersion
 
-if ! downloadUrl=$(get --json-path '$.link' "https://api.magmafoundation.org/api/v2/${VERSION}/latest"); then
+if ! downloadUrl=$(get --json-path '$.link' "https://api.magmafoundation.org/api/v2/${VERSION}/latest/${MAGMA_VERSION}"); then
   log "ERROR failed to locate latest Magma download for ${VERSION}. Is that version supported?"
   exit 1
 fi