ci: migrate Rust workflow jobs from self-hosted to standard GitHub runners

Self-hosted DH-runners have been decommissioned. Switch all Rust build,
test, and lint workflows to ubuntu-latest and use apt-based dependency
installation (install-deps: true default) instead of the self-hosted path.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.github/workflows/actions/setup-env/action.yml

@@ -8,7 +8,7 @@ inputs:
     default: "cache"
   
   install-deps:
-    description: "Whether to install system dependencies. Set to false for self-hosted runners with pre-installed deps"
+    description: "Whether to install system dependencies via apt. Set to false to install dependencies locally without sudo."
     required: false
     default: "true"
 
@@ -128,9 +128,9 @@ runs:
       shell: bash
       run: sudo apt-get update && sudo apt-get install -y libpq-dev libclang-dev
     
-    # Auto-install missing dependencies when install-deps is false (for self-hosted runners)
+    # Auto-install missing dependencies locally when install-deps is false (no sudo required)
     # Note: PATH and env vars are already set up in "Setup paths for cached tools" step
-    - name: Setup system dependencies (self-hosted)
+    - name: Setup system dependencies (local install)
       if: inputs.install-deps == 'false'
       shell: bash
       run: |
@@ -226,8 +226,8 @@ runs:
       with:
         repo-token: ${{ github.token }}
     
-    # Auto-install protoc when install-deps is false (for self-hosted runners)
-    - name: Setup Protoc (self-hosted)
+    # Auto-install protoc locally when install-deps is false (no sudo required)
+    - name: Setup Protoc (local install)
       if: inputs.install-deps == 'false'
       shell: bash
       run: |

.github/workflows/task-build-operator.yml

@@ -20,8 +20,7 @@ jobs:
     outputs:
       binary-hash: ${{ steps.hash-binary.outputs.datahaven-node-hash }}
     name: Build operator binary
-    runs-on:
-      group: DH-runners
+    runs-on: ubuntu-latest
     env:
       RUSTC_WRAPPER: "sccache"
       CARGO_INCREMENTAL: "0"
@@ -42,7 +41,6 @@ jobs:
       - uses: ./.github/workflows/actions/setup-env
         with:
           cache-key: BUILD-RELEASE
-          install-deps: false
 
       - name: Set build flags
         run: echo "RUSTFLAGS=${{ env.RUSTFLAGS }} -C linker=clang -C link-arg=-fuse-ld=mold" >> $GITHUB_ENV

.github/workflows/task-build-static-operator.yaml

@@ -10,8 +10,7 @@ on:
 jobs:
   build-node:
     name: Build operator binary
-    runs-on:
-      group: DH-runners
+    runs-on: ubuntu-latest
     env:
       RUSTC_WRAPPER: "sccache"
       CARGO_INCREMENTAL: "0"
@@ -29,8 +28,6 @@ jobs:
       - uses: ./.github/workflows/actions/setup-env
         with:
           cache-key: BUILD-RELEASE
-          install-deps: false
-          skip-libpq: true
 
       - name: Set build flags
         run: echo "RUSTFLAGS=-C linker=clang -C link-arg=-fuse-ld=mold" >> $GITHUB_ENV

.github/workflows/task-publish-binary.yml

@@ -31,8 +31,7 @@ jobs:
           retention-days: 1
 
   build-binary:
-    runs-on:
-      group: DH-runners
+    runs-on: ubuntu-latest
     needs: ["prepare-sources"]
     permissions:
       contents: read

.github/workflows/task-rust-lint.yml

@@ -27,8 +27,7 @@ env:
 jobs:
   cargo-fmt:
     name: "Check format with rustfmt"
-    runs-on:
-      group: DH-runners
+    runs-on: ubuntu-latest
     defaults:
       run:
         working-directory: ${{ env.WORKING_DIR }}
@@ -38,15 +37,13 @@ jobs:
       - uses: ./.github/workflows/actions/setup-env
         with:
           cache-key: FMT
-          install-deps: false  # Self-hosted runners have deps pre-installed
 
       - name: Run cargo fmt
         run: cargo fmt --all -- --check
 
   check-rust-lint:
     name: "Check lint with clippy"
-    runs-on:
-      group: DH-runners
+    runs-on: ubuntu-latest
     defaults:
       run:
         working-directory: ${{ env.WORKING_DIR }}
@@ -56,7 +53,6 @@ jobs:
       - uses: ./.github/workflows/actions/setup-env
         with:
           cache-key: LINT
-          install-deps: false  # Self-hosted runners have deps pre-installed
 
       - name: Set build flags
         run: echo "RUSTFLAGS=${{ env.RUSTFLAGS }} -C linker=clang -C link-arg=-fuse-ld=mold" >> $GITHUB_ENV
@@ -66,8 +62,7 @@ jobs:
 
   check-cargo-sort:
     name: "Check Cargo sort"
-    runs-on:
-      group: DH-runners
+    runs-on: ubuntu-latest
 
     defaults:
       run:

.github/workflows/task-rust-tests.yml

@@ -13,8 +13,7 @@ permissions:
 jobs:
   rust-tests:
     name: Run Operator Rust tests
-    runs-on:
-      group: DH-runners
+    runs-on: ubuntu-latest
     env:
       RUSTC_WRAPPER: "sccache"
       CARGO_INCREMENTAL: "0"
@@ -32,7 +31,6 @@ jobs:
       - uses: ./.github/workflows/actions/setup-env
         with:
           cache-key: "TEST"
-          install-deps: false
 
       - name: Set build flags
         run: echo "RUSTFLAGS=${{ env.RUSTFLAGS }} -C linker=clang -C link-arg=-fuse-ld=mold" >> $GITHUB_ENV

.github/workflows/task-warm-sccache.yml

@@ -15,8 +15,7 @@ permissions:
 jobs:
   warm-cache:
     name: Warm sccache cache
-    runs-on:
-      group: DH-runners
+    runs-on: ubuntu-latest
     env:
       RUSTC_WRAPPER: "sccache"
       CARGO_INCREMENTAL: "0"
@@ -34,7 +33,6 @@ jobs:
       - uses: ./.github/workflows/actions/setup-env
         with:
           cache-key: WARM
-          install-deps: false
 
       - name: Set build flags
         run: echo "RUSTFLAGS=${{ env.RUSTFLAGS }} -C linker=clang -C link-arg=-fuse-ld=mold" >> $GITHUB_ENV