Fix ARM64 support for old terraform versions

Author: Samusia

libexec/tfenv-install

@@ -85,7 +85,16 @@ fi;
 # Add support of ARM64 for Linux & Apple Silicon
 case "$(uname -m)" in
   aarch64* | arm64*)
-    TFENV_ARCH="${TFENV_ARCH:-arm64}";
+    # There is no arm64 support for versions:
+    # < 0.11.15
+    # >= 0.12.0, < 0.12.30
+    if [[ "${version}" =~ (0\.(([0-9]|1[0-1])).[0-1][0-4]?$) ]] || [[ "${version}" =~ 0\.12\.[0-2][0-9]?$ ]] ; then
+      TFENV_ARCH="${TFENV_ARCH:-amd64}";
+      echo "1"
+    else
+      TFENV_ARCH="${TFENV_ARCH:-arm64}";
+      echo "2"
+    fi;
     ;;
   *)
     TFENV_ARCH="${TFENV_ARCH:-amd64}";