Automatically release a new version of flyctl daily (#3626)

* Automatically release a new version of flyctl daily

* Only run monday through thursday

* Added some info about automatic releases to the README

* Eastern Standard Time

Not Eastern time (daylight savings not included)

.github/workflows/auto-release.yml

@@ -0,0 +1,17 @@
+name: Automatically release a new version of flyctl
+
+on:
+  schedule:
+    - cron: '0 20 * * MON-THU'  # Runs at 3 PM Eastern Standard Time Monday Through Thursday (8 PM UTC)
+
+jobs:
+  run_script:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout master branch
+        uses: actions/checkout@v3
+        with:
+          ref: master
+      - name: bump version
+        run: |
+          ./scripts/force_bump_version.sh

README.md

@@ -89,6 +89,9 @@ app: banana
 
 `flyctl` will operate against the `banana` app unless overridden by the -a flag or other app name setting in the command line.
 
+## Releases
+`flyctl` is automatically released at 3 PM Eastern Standard Time Monday - Thursday. If needed, you can bump a release by running `./scripts/bump_version.sh`.
+
 ## Building on Windows
 
 There is a simple Powershell script, `winbuild.ps1`, which will run the code generation for the help files, format them, and run a full build, leaving a new binary in the bin directory.

scripts/force_bump_version.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+ORIGIN=${ORIGIN:-origin}
+
+bump=${1:-patch}
+
+dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+
+previous_version="$("$dir"/../scripts/version.sh -s)"
+
+prerelversion=$("$dir"/../scripts/semver get prerel "$previous_version")
+if [[ $prerelversion == "" ]]; then
+  new_version=$("$dir"/../scripts/semver bump "$bump" "$previous_version")
+else
+  new_version=${previous_version//-$prerelversion/}
+fi
+
+new_version="v$new_version"
+
+echo "Bumping version from v${previous_version} to ${new_version}"
+
+git tag -m "release ${new_version}" -a "$new_version" && git push "${ORIGIN}" tag "$new_version"