Update validate pipeline

Author: hasufell

.github/workflows/validate.yml

@@ -6,11 +6,6 @@ defaults:
   run:
     shell: bash
 
-# See: https://docs.github.com/en/actions/reference/workflow-syntax-for-github-actions#concurrency.
-concurrency:
-  group: ${{ github.ref }}-${{ github.workflow }}
-  cancel-in-progress: true
-
 on:
   push:
     branches:
@@ -19,6 +14,7 @@ on:
   release:
     types:
       - created
+  workflow_dispatch:
 
 env:
   # We choose a stable ghc version across all os's

cabal.project.validate

@@ -30,3 +30,14 @@ package cabal-testsuite
   ghc-options: -Werror
 package cabal-install
   ghc-options: -Werror
+
+constraints: tar >= 0.6.2.0,
+             bzlib-conduit >= 0.3.0.3,
+             bz2 >= 1.0.1.1,
+             bzlib >= 0.5.2.0,
+             directory >= 1.3.8.3,
+             filepath == 1.4.101.0 || == 1.4.300.1 || >= 1.5.2.0
+
+package zlib
+  flags: -pkg-config +bundled-c-zlib
+