Fixing CI (pgcentralfoundation#2143)

CI has bitrotted and it looks like the new rust 1.90.0 lights up some of
our "ui" tests, and I'd prefer to not deal with that, so this also adds
a rust-toolchain.toml to set us to 1.89.0

Author: eeeebbbbrrrr

.github/workflows/runas.yml

@@ -86,6 +86,11 @@ jobs:
           cargo --version
           pg_config --version
 
+      - name: Install rustfmt & clippy
+        run: |
+          rustup component add rustfmt
+          rustup component add clippy
+
       - name: Install cargo pgrx
         run: cd cargo-pgrx && cargo install --path . --debug
 

.github/workflows/tests.yml

@@ -74,6 +74,11 @@ jobs:
       - name: Print sccache stats (before)
         run: sccache --show-stats
 
+      - name: Install rustfmt & clippy
+        run: |
+          rustup component add rustfmt
+          rustup component add clippy
+
       - name: Run rustfmt
         run: cargo fmt --all -- --check
 
@@ -219,6 +224,11 @@ jobs:
       - name: Print sccache stats (before run)
         run: sccache --show-stats
 
+      - name: Install rustfmt & clippy
+        run: |
+          rustup component add rustfmt
+          rustup component add clippy
+
       - name: Install cargo-pgrx
         run: cargo install --path cargo-pgrx/ --debug --force
 
@@ -374,6 +384,11 @@ jobs:
       - name: Print sccache stats (before)
         run: sccache --show-stats
 
+      - name: Install rustfmt & clippy
+        run: |
+          rustup component add rustfmt
+          rustup component add clippy
+
       - name: Install cargo-pgrx
         run: cargo install --path cargo-pgrx/ --debug --force
 
@@ -495,6 +510,11 @@ jobs:
       - name: Print sccache stats
         run: sccache --show-stats
 
+      - name: Install rustfmt & clippy
+        run: |
+          rustup component add rustfmt
+          rustup component add clippy
+
       - name: Install cargo-pgrx
         run: cargo install --path cargo-pgrx/ --debug --force
 
@@ -575,6 +595,11 @@ jobs:
       - name: Install cargo-pgrx
         run: cargo install --path cargo-pgrx/ --debug --force
 
+      - name: Install rustfmt & clippy
+        run: |
+          rustup component add rustfmt
+          rustup component add clippy
+
       - name: Print sccache stats
         run: sccache --show-stats
 

Cargo.lock

@@ -0,0 +1,2 @@
+[toolchain]
+channel = "1.89.0"