feat(ci): ghcr docker images

[ratankaliani]

Create GHCR Docker images on a PR to main or a push request. Simplifies infrastructure.

Additionally, fix CI for broken cost estimator + Docker workflow.

[github-actions]

Metric	Value
Batch Start	22,089,330
Batch End	22,089,335
Witness Generation (seconds)	43
Execution Duration (seconds)	81
Total Instruction Count	1,702,228,887
Oracle Verify Cycles	519,185,114
Derivation Cycles	865,709,500
Block Execution Cycles	198,147,939
Blob Verification Cycles	235,191,514
Total SP1 Gas	2,019,739,133
Number of Blocks	6
Number of Transactions	140
Ethereum Gas Used	15,175,608
Cycles per Block	283,704,814
Cycles per Transaction	12,158,777
Transactions per Block	23
Gas Used per Block	2,529,268
Gas Used per Transaction	108,397
BN Pair Cycles	0
BN Add Cycles	0
BN Mul Cycles	0
KZG Eval Cycles	0
EC Recover Cycles	1,254,053