docs: Update benchmark results for 0.7.0 release (#1548)

Author: andygrove

README.md

@@ -46,23 +46,23 @@ The following chart shows the time it takes to run the 22 TPC-H queries against
 using a single executor with 8 cores. See the [Comet Benchmarking Guide](https://datafusion.apache.org/comet/contributor-guide/benchmarking.html)
 for details of the environment used for these benchmarks.
 
-When using Comet, the overall run time is reduced from 640 seconds to 331 seconds, very close to a 2x speedup.
+When using Comet, the overall run time is reduced from 626 seconds to 290 seconds, a 2.2x speedup.
 
-![](docs/source/_static/images/benchmark-results/0.5.0/tpch_allqueries.png)
+![](docs/source/_static/images/benchmark-results/0.7.0/tpch_allqueries.png)
 
 Here is a breakdown showing relative performance of Spark and Comet for each TPC-H query.
 
-![](docs/source/_static/images/benchmark-results/0.5.0/tpch_queries_compare.png)
+![](docs/source/_static/images/benchmark-results/0.7.0/tpch_queries_compare.png)
 
 The following charts shows how much Comet currently accelerates each query from the benchmark.
 
 ### Relative speedup
 
-![](docs/source/_static/images/benchmark-results/0.5.0/tpch_queries_speedup_rel.png)
+![](docs/source/_static/images/benchmark-results/0.7.0/tpch_queries_speedup_rel.png)
 
 ### Absolute speedup
 
-![](docs/source/_static/images/benchmark-results/0.5.0/tpch_queries_speedup_abs.png)
+![](docs/source/_static/images/benchmark-results/0.7.0/tpch_queries_speedup_abs.png)
 
 These benchmarks can be reproduced in any environment using the documentation in the 
 [Comet Benchmarking Guide](https://datafusion.apache.org/comet/contributor-guide/benchmarking.html). We encourage 

benchmarks/Dockerfile

@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM apache/datafusion-comet:latest
+FROM apache/datafusion-comet:0.7.0-spark3.5.4-scala2.12-java11
 
 RUN apt update \
     && apt install -y git python3 python3-pip \