diff --git a/.forgejo/workflows/baseline.yml b/.forgejo/workflows/baseline.yml
index f56f4ba..5835341 100644
--- a/.forgejo/workflows/baseline.yml
+++ b/.forgejo/workflows/baseline.yml
@@ -81,8 +81,18 @@ jobs:
           set -eux
           # Same service-IP dance as build.yml's integration job; see the long
           # comment there for why the job name must stay separator-free.
-          PG=$(docker ps --filter "name=compare" --filter "ancestor=pgvector/pgvector:pg16" -q | head -n1)
-          test -n "$PG"
+          # Only THIS job's services. The runner's docker daemon is shared, so another
+          # repo's job can be running beside this one, and a job-name filter matches its
+          # containers too (Steward run 8358 and Inkwell run 8653 each took another repo's
+          # Postgres). act names every container of a task GITEA-ACTIONS-TASK-<n>-...: read
+          # <n> from our own container (its id is in the /etc/hostname bind mount) and
+          # require exactly one match.
+          SELF=$(grep -o '/containers/[0-9a-f]\{64\}/' /proc/self/mountinfo | head -n1 | cut -d/ -f3 || true)
+          SELF=${SELF:-$(hostname)}
+          TASK=$(docker inspect -f '{{.Name}}' "$SELF" | grep -o 'GITEA-ACTIONS-TASK-[0-9]*-')
+          test -n "$TASK"
+          PG=$(docker ps --filter "name=$TASK" --filter "ancestor=pgvector/pgvector:pg16" -q)
+          test "$(printf '%s\n' "$PG" | grep -c .)" -eq 1
           PG_IP=$(docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' "$PG")
           test -n "$PG_IP"
           echo "PG_CONTAINER=$PG" >> "$GITHUB_ENV"
diff --git a/.forgejo/workflows/build.yml b/.forgejo/workflows/build.yml
index 2dab36a..8538bb3 100644
--- a/.forgejo/workflows/build.yml
+++ b/.forgejo/workflows/build.yml
@@ -532,9 +532,20 @@ jobs:
           echo "=== container landscape (diagnostic for filter scoping) ==="
           docker ps -a --format '{{.ID}} {{.Image}} -> {{.Names}}'
           echo "=== end landscape ==="
-          PG=$(docker ps --filter "name=integration" --filter "ancestor=pgvector/pgvector:pg16" -q | head -n1)
-          RD=$(docker ps --filter "name=integration" --filter "ancestor=redis:8-alpine" -q | head -n1)
-          test -n "$PG" && test -n "$RD"
+          # Only THIS job's services. The runner's docker daemon is shared, so another
+          # repo's job can be running beside this one, and a job-name filter matches its
+          # containers too (Steward run 8358 and Inkwell run 8653 each took another repo's
+          # Postgres). act names every container of a task GITEA-ACTIONS-TASK-<n>-...: read
+          # <n> from our own container (its id is in the /etc/hostname bind mount) and
+          # require exactly one match.
+          SELF=$(grep -o '/containers/[0-9a-f]\{64\}/' /proc/self/mountinfo | head -n1 | cut -d/ -f3 || true)
+          SELF=${SELF:-$(hostname)}
+          TASK=$(docker inspect -f '{{.Name}}' "$SELF" | grep -o 'GITEA-ACTIONS-TASK-[0-9]*-')
+          test -n "$TASK"
+          PG=$(docker ps --filter "name=$TASK" --filter "ancestor=pgvector/pgvector:pg16" -q)
+          test "$(printf '%s\n' "$PG" | grep -c .)" -eq 1
+          RD=$(docker ps --filter "name=$TASK" --filter "ancestor=redis:8-alpine" -q)
+          test "$(printf '%s\n' "$RD" | grep -c .)" -eq 1
           PG_IP=$(docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' "$PG")
           RD_IP=$(docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' "$RD")
           test -n "$PG_IP" && test -n "$RD_IP"
@@ -1718,9 +1729,20 @@ jobs:
           # Service discovery mirrors the integration lane above: these jobs run
           # in a container against a mounted docker socket, so the services are
           # SIBLINGS reachable by IP, not by hostname.
-          PG=$(docker ps --filter "name=smoke" --filter "ancestor=pgvector/pgvector:pg16" -q | head -n1)
-          RD=$(docker ps --filter "name=smoke" --filter "ancestor=redis:8-alpine" -q | head -n1)
-          test -n "$PG" && test -n "$RD"
+          # Only THIS job's services. The runner's docker daemon is shared, so another
+          # repo's job can be running beside this one, and a job-name filter matches its
+          # containers too (Steward run 8358 and Inkwell run 8653 each took another repo's
+          # Postgres). act names every container of a task GITEA-ACTIONS-TASK-<n>-...: read
+          # <n> from our own container (its id is in the /etc/hostname bind mount) and
+          # require exactly one match.
+          SELF=$(grep -o '/containers/[0-9a-f]\{64\}/' /proc/self/mountinfo | head -n1 | cut -d/ -f3 || true)
+          SELF=${SELF:-$(hostname)}
+          TASK=$(docker inspect -f '{{.Name}}' "$SELF" | grep -o 'GITEA-ACTIONS-TASK-[0-9]*-')
+          test -n "$TASK"
+          PG=$(docker ps --filter "name=$TASK" --filter "ancestor=pgvector/pgvector:pg16" -q)
+          test "$(printf '%s\n' "$PG" | grep -c .)" -eq 1
+          RD=$(docker ps --filter "name=$TASK" --filter "ancestor=redis:8-alpine" -q)
+          test "$(printf '%s\n' "$RD" | grep -c .)" -eq 1
           PG_IP=$(docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' "$PG")
           RD_IP=$(docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' "$RD")
           test -n "$PG_IP" && test -n "$RD_IP"