remove unnecessary support for prebuilt binaries

the users will know how to build the binaries themselves.

release

@@ -1,39 +1,25 @@
 #!/bin/bash
 set -euo pipefail
 
-err() {
-    >&2 echo "ERROR: $*"
-    exit 1
-}
+_err(){ >&2 echo "ERROR: $*"; exit 1; }
 
 git status --porcelain | grep -q "" &&
-    err "working tree is dirty, commit your changes first."
-
-# https://raimue.blog/2010/09/09/bash-for-loop-with-glob-patterns/
-shopt -s nullglob
-for file in sha256sum-*; do
-    err "found $file from previous release, delete it first"
-done
-shopt -u nullglob
+    _err "working tree is dirty, commit your changes first."
 
 [[ "$1" =~ ^v([0-9]+)\.([0-9]+)(\.([0-9]+))?$ ]] || \
-    err "arg1 accepts the following formats: v1.0 v1.0.0"
+    _err "arg1 accepts the following formats: v1.0 v1.0.0"
 
 git tag | grep -q "^$1$" &&
-    err "tag $1 already exists"
+    _err "tag $1 already exists"
+
+# sanity test: do the tests pass?
+make -B -j"$(nproc)" test lint
 
 last_tag=$(git tag | tail -1)
 
-make -B -j"$(nproc)" VSN="$1" sha256sum-asc
-
 {
     echo undocker "$1"
     echo
     echo Changelog since "$last_tag":
     git log --pretty=format:"- [%cn] %s" "$last_tag"..HEAD
-    echo
-    echo
-    echo sha256sums of released binaries:
-    cat sha256sum-*.txt
-    echo
 } | git tag -u motiejus@jakstys.lt -F - "$1"