Avoid installing protoc for most CI workflows

It seems like it should only be needed for the all-features workflow,
which enables `otel` via `--all-features`.

Because we get rate-limited by something inside the setup-protoc Action,
this is a fairly frequent source of spurious CI failures.

Author: djc

.github/workflows/centos-fmt-clippy-on-all.yaml

@@ -72,10 +72,6 @@ jobs:
         run: |
           rustup component add rustfmt
           rustup component add clippy
-      - name: Install Protoc
-        uses: arduino/setup-protoc@v1
-        with:
-          version: '3.x'
       - name: Run the centos check within the docker image
         run: |
           docker run \

.github/workflows/linux-builds-on-master.yaml

@@ -98,10 +98,6 @@ jobs:
           echo "DOCKER=$DOCKER" >> $GITHUB_ENV
       - name: Fetch the docker
         run: bash ci/fetch-rust-docker.bash "${TARGET}"
-      - name: Install Protoc
-        uses: arduino/setup-protoc@v1
-        with:
-          version: '3.x'
       - name: Maybe build a docker from there
         run: |
           if [ -f "ci/docker/$DOCKER/Dockerfile" ]; then

.github/workflows/linux-builds-on-pr.yaml

@@ -92,10 +92,6 @@ jobs:
           echo "DOCKER=$DOCKER" >> $GITHUB_ENV
       - name: Fetch the docker
         run: bash ci/fetch-rust-docker.bash "${TARGET}"
-      - name: Install Protoc
-        uses: arduino/setup-protoc@v1
-        with:
-          version: '3.x'
       - name: Maybe build a docker from there
         run: |
           if [ -f "ci/docker/$DOCKER/Dockerfile" ]; then

.github/workflows/linux-builds-on-stable.yaml

@@ -122,10 +122,6 @@ jobs:
           echo "DOCKER=$DOCKER" >> $GITHUB_ENV
       - name: Fetch the docker
         run: bash ci/fetch-rust-docker.bash "${TARGET}"
-      - name: Install Protoc
-        uses: arduino/setup-protoc@v1
-        with:
-          version: '3.x'
       - name: Maybe build a docker from there
         run: |
           if [ -f "ci/docker/$DOCKER/Dockerfile" ]; then

ci/actions-templates/centos-fmt-clippy-template.yaml

@@ -72,10 +72,6 @@ jobs:
         run: |
           rustup component add rustfmt
           rustup component add clippy
-      - name: Install Protoc
-        uses: arduino/setup-protoc@v1
-        with:
-          version: '3.x'
       - name: Run the centos check within the docker image
         run: |
           docker run \

ci/actions-templates/linux-builds-template.yaml

@@ -131,10 +131,6 @@ jobs:
           echo "DOCKER=$DOCKER" >> $GITHUB_ENV
       - name: Fetch the docker
         run: bash ci/fetch-rust-docker.bash "${TARGET}"
-      - name: Install Protoc
-        uses: arduino/setup-protoc@v1
-        with:
-          version: '3.x'
       - name: Maybe build a docker from there
         run: |
           if [ -f "ci/docker/$DOCKER/Dockerfile" ]; then