Check for duplicate crate versions

.github/workflows/rust.yml

@@ -48,3 +48,7 @@ jobs:
         run: cargo check -p divviup-cli --no-default-features --features ring,common
       - name: check cli +default +admin
         run: cargo check -p divviup-cli --features admin
+      - name: cargo deny
+        uses: EmbarkStudios/cargo-deny-action@v2.0.4
+        with:
+          command: check bans

deny.toml

@@ -0,0 +1,25 @@
+[graph]
+targets = [{ triple = "x86_64-unknown-linux-gnu" }, { triple = "x86_64-unknown-linux-musl" }]
+all-features = true
+
+[advisories]
+version = 2
+
+[bans]
+multiple-versions = "allow"
+deny = [{ name = "tracing", deny-multiple-versions = true }, { name = "opentelemetry", deny-multiple-versions = true }]
+
+[sources]
+unknown-registry = "deny"
+unknown-git = "deny"
+required-git-spec = "rev"
+allow-org = { github = ["divviup"] }
+
+[licenses]
+version = 2
+allow = ["MPL-2.0", "MIT", "Apache-2.0", "BSL-1.0", "BSD-2-Clause", "BSD-3-Clause", "Unicode-DFS-2016", "Unicode-3.0", "ISC", "OpenSSL", "Unlicense", "CC0-1.0"]
+
+[[licenses.clarify]]
+name = "ring"
+expression = "MIT AND ISC AND OpenSSL"
+license-files = [{ path = "LICENSE", hash = 0xbd0eed23 }]