Add MSRV minimal versions in CI

Author: Empty2k12

Diff for: .github/workflows/rust.yml

@@ -7,6 +7,19 @@ on:
   pull_request:
 
 jobs:
+  # this checks the msrv
+  msrv:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: baptiste0928/cargo-install@v2
+        with:
+          crate: cargo-msrv
+      - name: Verify minimum rust version of influxdb crate
+        run: cargo-msrv --path influxdb verify
+      - name: Verify minimum rust version of influxdb_derive crate
+        run: cargo-msrv --path influxdb_derive verify
+
   # this checks that the readme created from rustdoc is up to date
   readmecheck:
     name: README Format Check
@@ -53,9 +66,6 @@ jobs:
       fail-fast: false
       matrix:
         rust:
-          - name: MSRV
-            toolchain: "1.65"
-            nightly: false
           - name: Stable
             toolchain: stable
             nightly: false
@@ -78,7 +88,7 @@ jobs:
             ~/.cargo/git
             ~/.cargo/registry
             target
-          key: "${{runner.os}} Rust ${{steps.rust-toolchain.outputs.cachekey}}"
+          key: "${{matrix.rust.toolchain}} on ${{runner.os}} Rust ${{steps.rust-toolchain.outputs.cachekey}}"
       - run: cargo test --lib
       - run: cargo test --doc
 

Diff for: influxdb/Cargo.toml

@@ -11,6 +11,7 @@ license = "MIT"
 readme = "README.md"
 include = ["src/**/*", "tests/**/*", "Cargo.toml", "LICENSE"]
 repository = "https://github.com/influxdb-rs/influxdb-rust"
+rust-version = "1.65"
 
 [dependencies]
 chrono = { version = "0.4.23", features = ["serde"], default-features = false }

Diff for: influxdb_derive/Cargo.toml

@@ -11,6 +11,7 @@ license = "MIT"
 readme = "README.md"
 include = ["src/**/*", "tests/**/*", "Cargo.toml", "LICENSE"]
 repository = "https://github.com/influxdb-rs/influxdb-rust"
+rust-version = "1.65"
 
 [lib]
 proc-macro = true