fix: don't use modified .cargo/config.toml (#26148)

We need to both add and remove keys from rustflags, but modifying
.cargo/config.toml in place causes the version string to have -dirty
appended to it. Use ci-support that instead creates ./.cargo/config (a
historic filename that is preferred over ./.cargo/config.toml if it
exists) and then git ignore ./.cargo/config.

References:
- https://github.com/influxdata/influxdb/issues/26147
- https://doc.rust-lang.org/cargo/reference/config.html?highlight=rustflags#hierarchical-structure

.circleci/config.yml

@@ -287,7 +287,7 @@ jobs:
   # Build a dev binary with the default cargo profile
   build-dev:
     docker:
-      - image: us-east1-docker.pkg.dev/influxdata-team-edge/ci-support/ci-cross-influxdb3@sha256:d0c9ed7385866ceeb9c143bda0e2ea607bed0000eb73577d02f9e52e1bddc2d6
+      - image: us-east1-docker.pkg.dev/influxdata-team-edge/ci-support/ci-cross-influxdb3@sha256:1f41029cb68a723c3b559a44bcf91e04b6a71b631b0886185562f4a90e1460ba
         auth:
           username: _json_key
           password: $CISUPPORT_GCS_AUTHORIZATION
@@ -350,7 +350,7 @@ jobs:
   # Compile cargo "release" profile binaries for influxdb3 edge releases
   build-release:
     docker:
-      - image: us-east1-docker.pkg.dev/influxdata-team-edge/ci-support/ci-cross-influxdb3@sha256:d0c9ed7385866ceeb9c143bda0e2ea607bed0000eb73577d02f9e52e1bddc2d6
+      - image: us-east1-docker.pkg.dev/influxdata-team-edge/ci-support/ci-cross-influxdb3@sha256:1f41029cb68a723c3b559a44bcf91e04b6a71b631b0886185562f4a90e1460ba
         auth:
           username: _json_key
           password: $CISUPPORT_GCS_AUTHORIZATION

.gitignore

@@ -21,3 +21,6 @@ valgrind-out.txt
 *.pending-snap
 # Helix editor configuration directory:
 **/.helix
+# .cargo/config.toml is checked in, but glibc builds create .cargo/config to
+# override it, which we can ignore
+.cargo/config