build: deduplicate MSRV definitions

.github/workflows/ci.yml

@@ -16,13 +16,19 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
+  read_msrv:
+    name: Read MSRV
+    uses: actions-rust-lang/msrv/.github/workflows/msrv.yml@main
+
   test:
     runs-on: ubuntu-latest
+    needs: read_msrv
+
     strategy:
       fail-fast: false
       matrix:
         toolchain:
-          - { name: msrv, version: "1.67" }
+          - { name: msrv, version: "${{ needs.read_msrv.outputs.msrv }}" }
           - { name: stable, version: stable }
 
     name: Test / ${{ matrix.toolchain.name }}
@@ -34,7 +40,7 @@ jobs:
         with:
           toolchain: ${{ matrix.toolchain.version }}
 
-      - name: Install just & nextest
+      - name: Install just, nextest
         uses: taiki-e/install-action@v2.33.12
         with:
           tool: just,nextest

justfile

@@ -7,6 +7,13 @@ clippy:
     cargo clippy --workspace --no-default-features --all-features
     cargo hack --feature-powerset --depth=3 clippy --workspace
 
+msrv := ```
+    cargo metadata --format-version=1 \
+    | jq -r 'first(.packages[] | select(.source == null and .name == "actix-tls")) | .rust_version' \
+    | sed -E 's/^1\.([0-9]{2})$/1\.\1\.0/'
+```
+msrv_rustup := "+" + msrv
+
 # Downgrade dev-dependencies necessary to run MSRV checks/tests.
 [private]
 downgrade-msrv:
@@ -15,8 +22,7 @@ downgrade-msrv:
     cargo update -p=trybuild --precise=1.0.90
 
 # Test workspace using MSRV
-test-msrv: downgrade-msrv
-    @just test-no-coverage +1.67.0
+test-msrv: downgrade-msrv (test-no-coverage msrv_rustup)
 
 # Test workspace without generating coverage files
 [private]