add workflow; wait for passage before starting most jobs

.github/workflows/test_pr_and_main.yml

@@ -17,9 +17,17 @@ defaults:
         shell: bash -l {0}
 
 jobs:
+  ruff:
+    name: Ruff Linting
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: chartboost/ruff-action@v1
+
   nompi4py:
     name: no mpi4py
     runs-on: ubuntu-latest
+    needs: [ruff]
     steps:
       - uses: actions/checkout@v3
       - uses: conda-incubator/setup-miniconda@v2
@@ -45,6 +53,7 @@ jobs:
   regression:
     name: Basic regression tests
     runs-on: ubuntu-latest
+    needs: [ruff]
 
     steps:
       - uses: actions/checkout@v3
@@ -86,6 +95,9 @@ jobs:
     name: run_all.py
     runs-on: ubuntu-latest
     timeout-minutes: 15
+    # this takes the most time, so we'll start it
+    # without waiting on the linting and other checks
+    # needs: [ruff]
 
     steps:
       - uses: actions/checkout@v3
@@ -117,6 +129,7 @@ jobs:
   schur-complement:
     name: schur-complement
     runs-on: ubuntu-latest
+    needs: [ruff]
     strategy:
       matrix:
         python-version: [3.8, 3.9]
@@ -151,6 +164,7 @@ jobs:
   straight-tests:
     name: straight_tests.py
     runs-on: ubuntu-latest
+    needs: [ruff]
 
     steps:
       - uses: actions/checkout@v3
@@ -176,6 +190,7 @@ jobs:
   admm-wrapper:
     name: admm wrapper tests
     runs-on: ubuntu-latest
+    needs: [ruff]
 
     steps:
       - uses: actions/checkout@v3
@@ -205,6 +220,7 @@ jobs:
   aph:
     name: aph tests
     runs-on: ubuntu-latest
+    needs: [ruff]
 
     steps:
       - uses: actions/checkout@v3
@@ -232,6 +248,7 @@ jobs:
   pickled-bundles:
     name: pickled bundles tests
     runs-on: ubuntu-latest
+    needs: [ruff]
 
     steps:
       - uses: actions/checkout@v3
@@ -259,6 +276,7 @@ jobs:
   confidence-intervals:
     name: confidence intervals tests
     runs-on: ubuntu-latest
+    needs: [ruff]
 
     steps:
       - uses: actions/checkout@v3
@@ -291,6 +309,7 @@ jobs:
   test-generic-pyomo-released:
     name: generic_tester.py
     runs-on: ubuntu-latest
+    needs: [ruff]
     timeout-minutes: 15
 
     steps:
@@ -323,6 +342,7 @@ jobs:
   test-gradient-rho:
     name: gradient and rho tests
     runs-on: ubuntu-latest
+    needs: [ruff]
 
     steps:
       - uses: actions/checkout@v3
@@ -354,7 +374,6 @@ jobs:
 
   test-headers:
     name: header test
-
     runs-on: ubuntu-latest
 
     steps:
@@ -381,8 +400,8 @@ jobs:
 
   test-pysp:
     name: pysp tests
-
     runs-on: ubuntu-latest
+    needs: [ruff]
 
     steps:
       - uses: actions/checkout@v3
@@ -415,8 +434,8 @@ jobs:
 
   test-cylinders:
     name: tests on some cylinders
-
     runs-on: ubuntu-latest
+    needs: [ruff]
 
     steps:
       - uses: actions/checkout@v3