[build] Overhaul Linux builds and refactor release workflow (#13997)

- Use `manylinux-shared` images for Linux builds
- Discontinue `yt-dlp_linux_armv7l`/`linux_armv7l_exe` release binary
- Add `yt-dlp_linux_armv7l.zip`/`linux_armv7l_dir` release binary
- Add `yt-dlp_musllinux` and `yt-dlp_musllinux_aarch64` release binaries
- Migrate `linux_exe` build strategy from staticx+musl to manylinux2014/glibc2.17
- Rewrite release.yml's "unholy bash monstrosity" as devscripts/setup_variables.py

Closes #10072, Closes #10630, Closes #10578, Closes #13976, Closes #13977, Closes #14106
Authored by: bashonly

bundle/docker/linux/verify.sh

@@ -0,0 +1,44 @@
+#!/bin/sh
+set -eu
+
+if [ -n "${TEST_ONEDIR_BUILD:-}" ]; then
+    echo "Extracting zip to verify onedir build"
+    if command -v python3 >/dev/null 2>&1; then
+        python3 -m zipfile -e "/build/${EXE_NAME}.zip" ./
+    else
+        echo "Attempting to install unzip"
+        if command -v dnf >/dev/null 2>&1; then
+            dnf -y install --allowerasing unzip
+        elif command -v yum >/dev/null 2>&1; then
+            yum -y install unzip
+        elif command -v apt-get >/dev/null 2>&1; then
+            DEBIAN_FRONTEND=noninteractive apt-get update -qq
+            DEBIAN_FRONTEND=noninteractive apt-get install -qq -y --no-install-recommends unzip
+        elif command -v apk >/dev/null 2>&1; then
+            apk add --no-cache unzip
+        else
+            echo "Unsupported image"
+            exit 1
+        fi
+        unzip "/build/${EXE_NAME}.zip" -d ./
+    fi
+else
+    echo "Verifying onefile build"
+    cp "/build/${EXE_NAME}" ./
+fi
+
+chmod +x "./${EXE_NAME}"
+
+if [ -n "${SKIP_UPDATE_TO:-}" ] || [ -n "${TEST_ONEDIR_BUILD:-}" ]; then
+    "./${EXE_NAME}" -v || true
+    "./${EXE_NAME}" --version
+    exit 0
+fi
+
+cp "./${EXE_NAME}" "./${EXE_NAME}_downgraded"
+version="$("./${EXE_NAME}" --version)"
+"./${EXE_NAME}_downgraded" -v --update-to yt-dlp/yt-dlp@2023.03.04
+downgraded_version="$("./${EXE_NAME}_downgraded" --version)"
+if [ "${version}" = "${downgraded_version}" ]; then
+    exit 1
+fi