Add Downgrade.yml and relax Julia compat to v1.7

.github/workflows/Downgrade.yml

@@ -0,0 +1,29 @@
+name: Downgrade
+on:
+  pull_request:
+    branches:
+      - main
+    paths-ignore:
+      - 'docs/**'
+  push:
+    branches:
+      - main
+    paths-ignore:
+      - 'docs/**'
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        version: ['1']
+    steps:
+      - uses: actions/checkout@v4
+      - uses: julia-actions/setup-julia@v1
+        with:
+          version: ${{ matrix.version }}
+      - uses: cjdoris/julia-downgrade-compat-action@v1
+#        if: ${{ matrix.version == '1.6' }}
+        with:
+          skip: Pkg,TOML
+      - uses: julia-actions/julia-buildpkg@v1
+      - uses: julia-actions/julia-runtest@v1

Project.toml

@@ -30,20 +30,20 @@ StartUpDGSummationByPartsOperatorsExt = "SummationByPartsOperators"
 TriangulatePlotsExt = "Plots"
 
 [compat]
-ConstructionBase = "1"
+ConstructionBase = "1.1"
 FillArrays = "0.13, 1"
-HDF5 = "0.16, 0.17"
+HDF5 = "0.17"
 Kronecker = "0.5"
 NodesAndModes = "1"
 PathIntersections = "0.1, 0.2"
-Plots = "1"
+Plots = "1.10"
 RecipesBase = "1"
-RecursiveArrayTools = "2, 3"
+RecursiveArrayTools = "2.38, 3"
 Reexport = "1"
 Setfield = "1"
-SparseArrays = "1"
-StaticArrays = "1"
-SummationByPartsOperators = "0.5"
-Triangulate = "2"
-WriteVTK = "1"
-julia = "1.10"
+SparseArrays = "1.10"
+StaticArrays = "1.5"
+SummationByPartsOperators = "0.5.29"
+Triangulate = "2.2"
+WriteVTK = "1.14.1"
+julia = "1.7"